Edgar Filing: NUVEEN SELECT TAX FREE INCOME PORTFOLIO

nq2.htm

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-6548

Nuveen Select Tax-Free Income Portfolio

(Exact name of registrant as specified in charter)

Nuveen Investments

333 West Wacker Drive, Chicago, Illinois 60606

(Address of principal executive offices) (Zip code)

Kevin J. McCarthy

Vice President and Secretary

333 West Wacker Drive, Chicago, Illinois 60606

(Name and address of agent for service)

Registrant's telephone number, including area code: 312-917-7700

Date of fiscal year end: 3/31

Date of reporting period: 6/30/11

Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.

Item 1. Schedule of Investments


	Portfolio of Investments (Unaudited)
	Nuveen Select Tax-Free Income Portfolio (NXP)
	June 30, 2011
Principal		Optional Call
Amount (000)	Description (1)	Provisions (2)	Ratings (3)	Value
	Municipal Bonds – 98.6%
	Alaska – 2.0%
$ 2,475	Alaska Municipal Bond Bank Authority, General Obligation Bonds, Series 2003E, 5.250%, 12/01/23	12/13 at 100.00	A+ (4)	$ 2,758,511
	(Pre-refunded 12/01/13) – NPFG Insured
2,635	Northern Tobacco Securitization Corporation, Alaska, Tobacco Settlement Asset-Backed Bonds,	6/14 at 100.00	Baa3	1,714,858
	Series 2006A, 5.000%, 6/01/46
5,110	Total Alaska			4,473,369
	Arizona – 0.2%
625	Pima County Industrial Development Authority, Arizona, Revenue Bonds, Tucson Electric Power	10/20 at 100.00	BBB–	572,788
	Company, Series 2010A, 5.250%, 10/01/40
	Arkansas – 0.3%
5,915	Arkansas Development Finance Authority, Tobacco Settlement Revenue Bonds, Arkansas Cancer	No Opt. Call	Aa2	805,505
	Research Center Project, Series 2006, 0.000%, 7/01/46 – AMBAC Insured
	California – 8.7%
2,000	Alameda Corridor Transportation Authority, California, Subordinate Lien Revenue Bonds, Series	10/17 at 100.00	A–	1,618,560
	2004A, 0.000%, 10/01/25 – AMBAC Insured
3,325	California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A, 6.000%,	5/12 at 101.00	AA– (4)	3,519,579
	5/01/14 (Pre-refunded 5/01/12)
1,000	California Statewide Community Development Authority, Revenue Bonds, Methodist Hospital	8/19 at 100.00	Aa2	1,112,360
	Project, Series 2009, 6.750%, 2/01/38
3,790	Coast Community College District, Orange County, California, General Obligation Bonds, Series	8/16 at 33.79	AA+	704,713
	2006C, 0.000%, 8/01/36 – AGM Insured
2,645	Cypress Elementary School District, Orange County, California, General Obligation Bonds,	No Opt. Call	AA+	575,711
	Series 2009A, 0.000%, 5/01/34 – AGM Insured
1,335	Golden State Tobacco Securitization Corporation, California, Enhanced Tobacco Settlement	No Opt. Call	A2	416,387
	Asset-Backed Revenue Bonds, Series 2005A, 0.000%, 6/01/28 – AMBAC Insured
3,000	Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed	6/13 at 100.00	AAA	3,359,430
	Bonds, Series 2003A-1, 6.750%, 6/01/39 (Pre-refunded 6/01/13)
2,350	Golden Valley Unified School District, Madera County, California, General Obligation Bonds,	8/17 at 56.07	AA+	708,690
	Election 2006 Series 2007A, 0.000%, 8/01/29 – AGM Insured
3,030	Grossmont Union High School District, San Diego County, California, General Obligation Bonds,	No Opt. Call	Aa2	1,335,412
	Series 2006, 0.000%, 8/01/25 – NPFG Insured
1,215	Los Angeles Department of Water and Power, California, Waterworks Revenue Refunding Bonds,	1/12 at 100.00	AA	1,215,219
	Series 2001A, 5.125%, 7/01/41 – FGIC Insured
365	Los Angeles, California, Parking System Revenue Bonds, Series 1999A, 5.250%, 5/01/29 –	11/11 at 100.00	AA–	365,850
	AMBAC Insured
1,000	Moreno Valley Unified School District, Riverside County, California, General Obligation Bonds,	No Opt. Call	A	473,020
	Series 2007, 0.000%, 8/01/23 – NPFG Insured
590	Palomar Pomerado Health Care District, California, Certificates of Participation, Series 2009,	11/19 at 100.00	Baa3	591,864
	6.750%, 11/01/39
1,700	Placentia-Yorba Linda Unified School District, Orange County, California, Certificates of	No Opt. Call	A+	335,869
	Participation, Series 2006, 0.000%, 10/01/34 – FGIC Insured
2,930	San Joaquin Hills Transportation Corridor Agency, Orange County, California, Toll Road Revenue	No Opt. Call	Baa1	702,848
	Refunding Bonds, Series 1997A, 0.000%, 1/15/27 – NPFG Insured
1,250	San Jose, California, Airport Revenue Bonds, Series 2004D, 5.000%, 3/01/28 – NPFG Insured	3/14 at 100.00	A	1,247,813
2,110	Sierra Sands Unified School District, Kern County, California, General Obligation Bonds,	No Opt. Call	Aa3	696,595
	Election of 2006, Series 2006A, 0.000%, 11/01/28 – FGIC Insured
750	Tobacco Securitization Authority of Northern California, Tobacco Settlement Asset-Backed	6/15 at 100.00	Baa3	488,813
	Bonds, Series 2005A-1, 5.500%, 6/01/45
1,150	Woodside Elementary School District, San Mateo County, California, General Obligation Bonds,	No Opt. Call	AAA	347,795
	Series 2007, 0.000%, 10/01/30 – AMBAC Insured
35,535	Total California			19,816,528
	Colorado – 8.5%
1,000	Colorado Health Facilities Authority, Health Facilities Revenue Bonds, Sisters of Charity of	No Opt. Call	AA	967,550
	Leavenworth Health Services Corporation, Series 2010A, 5.000%, 1/01/40
	Colorado Health Facilities Authority, Revenue Bonds, Catholic Health Initiatives, Series 2002A:
1,700	5.500%, 3/01/22 (Pre-refunded 3/02/12)	3/12 at 100.00	AA (4)	1,759,160
690	5.500%, 3/01/22 (Pre-refunded 3/01/12)	3/12 at 100.00	Aa2 (4)	714,012
5,295	Denver City and County, Colorado, Airport System Revenue Bonds, Series 1991D, 7.750%, 11/15/13	No Opt. Call	A+	5,760,430
	(Alternative Minimum Tax)
5,000	Denver City and County, Colorado, Airport System Revenue Refunding Bonds, Series 2001A,	11/11 at 100.00	A+	5,070,150
	5.625%, 11/15/17 – FGIC Insured (Alternative Minimum Tax)
3,000	Denver Convention Center Hotel Authority, Colorado, Revenue Bonds, Convention Center Hotel,	12/13 at 100.00	N/R (4)	3,296,580
	Senior Lien Series 2003A, 5.000%, 12/01/23 (Pre-refunded 12/01/13) – SYNCORA GTY Insured
500	Denver, Colorado, Airport System Revenue Refunding Bonds, Series 2003B, 5.000%, 11/15/33 –	11/13 at 100.00	A+	497,640
	SYNCORA GTY Insured
12,500	E-470 Public Highway Authority, Colorado, Toll Revenue Bonds, Series 2006B, 0.000%, 9/01/38 –	9/26 at 54.77	Baa1	1,505,500
	NPFG Insured
29,685	Total Colorado			19,571,022
	Florida – 7.4%
2,000	Halifax Hospital Medical Center, Florida, Revenue Bonds, Series 2006, 5.375%, 6/01/46	6/16 at 100.00	A–	1,828,560
5,000	Jacksonville Health Facilities Authority, Florida, Revenue Bonds, Ascension Health, Series	11/12 at 101.00	AA+	5,054,100
	2002A, 5.250%, 11/15/32
10,000	JEA St. John’s River Power Park System, Florida, Revenue Refunding Bonds, Issue 2, Series	10/11 at 100.00	Aa2	10,102,599
	2002-17, 5.000%, 10/01/17
17,000	Total Florida			16,985,259
	Georgia – 0.9%
2,000	Franklin County Industrial Building Authority, Georgia, Revenue Bonds, Ty Cobb Regional	12/20 at 100.00	N/R	2,000,820
	Medical Center Project, Series 2010, 8.125%, 12/01/45
	Illinois – 15.1%
2,465	Board of Trustees of Southern Illinois University, Housing and Auxiliary Facilities System	No Opt. Call	A2	1,595,521
	Revenue Bonds, Series 1999A, 0.000%, 4/01/20 – NPFG Insured
2,600	Chicago Heights, Illinois, General Obligation Corporate Purpose Bonds, Series 1993, 5.650%,	12/11 at 100.00	BBB	2,653,222
	12/01/17 – FGIC Insured
195	DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds,	11/13 at 100.00	Aa3	210,347
	Series 2003B, 5.250%, 11/01/20 – AGM Insured
805	DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds,	11/13 at 100.00	Aa3 (4)	893,115
	Series 2003B, 5.250%, 11/01/20 (Pre-refunded 11/01/13) – AGM Insured
600	Illinois Educational Facilities Authority, Student Housing Revenue Bonds, Educational	5/12 at 101.00	Aaa	634,722
	Advancement Foundation Fund, University Center Project, Series 2002, 6.000%, 5/01/22
	(Pre-refunded 5/01/12)
1,050	Illinois Finance Authority, Revenue Bonds, Loyola University of Chicago, Tender Option Bond	No Opt. Call	AA+	1,054,200
	Trust 1137, 9.316%, 7/01/15 (IF)
4,000	Illinois Finance Authority, Revenue Bonds, Northwestern Memorial Hospital, Series 2004A,	8/14 at 100.00	N/R (4)	4,571,040
	5.500%, 8/15/43 (Pre-refunded 8/15/14)
1,000	Illinois Finance Authority, Revenue Bonds, Silver Cross Hospital and Medical Centers, Series	8/19 at 100.00	BBB	1,029,630
	2009, 6.875%, 8/15/38
2,100	Illinois Finance Authority, Revenue Refunding Bonds, Silver Cross Hospital and Medical	8/18 at 100.00	BBB	1,925,490
	Centers, Series 2008A, 5.500%, 8/15/30
1,320	Illinois Health Facilities Authority, Revenue Bonds, Decatur Memorial Hospital, Series 2001,	10/11 at 100.00	A	1,328,131
	5.600%, 10/01/16
2,950	Illinois Health Facilities Authority, Revenue Bonds, Lake Forest Hospital, Series 2002A,	7/12 at 100.00	AA+	3,057,882
	6.000%, 7/01/17
2,275	Illinois Health Facilities Authority, Revenue Refunding Bonds, Elmhurst Memorial Healthcare,	1/13 at 100.00	Baa1	2,345,252
	Series 2002, 6.250%, 1/01/17
450	Illinois Health Facilities Authority, Revenue Refunding Bonds, Rockford Health System, Series	8/11 at 100.00	N/R	391,968
	1997, 5.000%, 8/15/21 – AMBAC Insured
3,125	Metropolitan Pier and Exposition Authority, Illinois, Revenue Bonds, McCormick Place Expansion	No Opt. Call	A2	2,515,906
	Project, Series 1993A, 0.000%, 6/15/17 – FGIC Insured
	Metropolitan Pier and Exposition Authority, Illinois, Revenue Bonds, McCormick Place Expansion
	Project, Series 2002A:
1,500	0.000%, 12/15/29 – NPFG Insured	No Opt. Call	AAA	519,300
810	0.000%, 6/15/30 – NPFG Insured	No Opt. Call	AAA	268,005
5,000	0.000%, 12/15/36 – NPFG Insured	No Opt. Call	AAA	1,008,150
5,000	Metropolitan Pier and Exposition Authority, Illinois, Revenue Refunding Bonds, McCormick Place	6/12 at 101.00	AAA	5,096,250
	Expansion Project, Series 2002B, 5.000%, 6/15/21 – NPFG Insured
1,300	Schaumburg, Illinois, General Obligation Bonds, Series 2004B, 5.250%, 12/01/34 – FGIC Insured	12/14 at 100.00	Aaa	1,327,638
	Yorkville, Illinois, General Obligation Debt Certificates, Series 2003:
1,000	5.000%, 12/15/19 (Pre-refunded 12/15/11) – RAAI Insured	12/11 at 100.00	N/R (4)	1,022,100
1,000	5.000%, 12/15/20 (Pre-refunded 12/15/11) – RAAI Insured	12/11 at 100.00	N/R (4)	1,022,100
40,545	Total Illinois			34,469,969
	Indiana – 6.5%
1,000	Franklin Community Multi-School Building Corporation, Marion County, Indiana, First Mortgage	7/14 at 100.00	A+ (4)	1,130,150
	Revenue Bonds, Series 2004, 5.000%, 7/15/22 (Pre-refunded 7/15/14) – FGIC Insured
1,525	Indiana Health Facility Financing Authority, Hospital Revenue Refunding Bonds, Columbus	No Opt. Call	AA+	1,695,571
	Regional Hospital, Series 1993, 7.000%, 8/15/15 – AGM Insured
1,000	Indiana Health Facility Financing Authority, Revenue Bonds, Community Foundation of Northwest	3/17 at 100.00	BBB+	937,330
	Indiana, Series 2007, 5.500%, 3/01/37
9,855	Indianapolis Local Public Improvement Bond Bank, Indiana, Waterworks Project, Series 2002A,	7/12 at 100.00	AAA	10,336,416
	5.125%, 7/01/21 (Pre-refunded 7/01/12) – NPFG Insured
750	West Clark 2000 School Building Corporation, Clark County, Indiana, First Mortgage Bonds,	1/15 at 100.00	AA+	777,233
	Series 2005, 5.000%, 7/15/22 – NPFG Insured
14,130	Total Indiana			14,876,700
	Iowa – 1.8%
1,000	Iowa Tobacco Settlement Authority, Asset Backed Settlement Revenue Bonds, Series 2005C,	6/15 at 100.00	BBB	762,160
	5.375%, 6/01/38
4,000	Iowa Tobacco Settlement Authority, Tobacco Asset-Backed Revenue Bonds, Series 2005B,	6/17 at 100.00	BBB	3,381,040
	5.600%, 6/01/34
5,000	Total Iowa			4,143,200
	Kansas – 0.5%
500	Lawrence, Kansas, Hospital Revenue Bonds, Lawrence Memorial Hospital, Refunding Series 2006,	7/16 at 100.00	A2	459,720
	4.875%, 7/01/36
750	Wamego, Kansas, Pollution Control Revenue Bonds, Kansas Gas and Electric Company, Series 2004,	6/14 at 100.00	BBB+	756,923
	5.300%, 6/01/31 – NPFG Insured
1,250	Total Kansas			1,216,643
	Louisiana – 1.2%
2,735	Tobacco Settlement Financing Corporation, Louisiana, Tobacco Settlement Asset-Backed Bonds,	11/11 at 101.00	A–	2,649,230
	Series 2001B, 5.875%, 5/15/39
	Massachusetts – 1.1%
500	Massachusetts Health and Educational Facilities Authority, Revenue Bonds, CareGroup Inc.,	7/18 at 100.00	A–	476,325
	Series 2008E-1 &2, 5.000%, 7/01/28
20	Massachusetts Health and Educational Facilities Authority, Revenue Bonds, Partners HealthCare	7/12 at 100.00	AA	20,272
	System Inc., Series 2001C, 6.000%, 7/01/17
1,935	Massachusetts Housing Finance Agency, Housing Bonds, Series 2009F, 5.700%, 6/01/40	12/18 at 100.00	AA–	1,960,561
2,455	Total Massachusetts			2,457,158
	Michigan – 1.3%
2,900	Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds, Trinity Health	12/12 at 100.00	AA	2,911,832
	Credit Group, Series 2002C, 5.375%, 12/01/30
	Missouri – 0.9%
	Kansas City Municipal Assistance Corporation, Missouri, Leasehold Revenue Bonds,
	Series 2004B-1:
500	0.000%, 4/15/23 – AMBAC Insured	No Opt. Call	AA+	295,275
5,000	0.000%, 4/15/30 – AMBAC Insured	No Opt. Call	AA–	1,672,000
5,500	Total Missouri			1,967,275
	Nevada – 5.2%
2,500	Clark County, Nevada, Motor Vehicle Fuel Tax Highway Improvement Revenue Bonds, Series 2003,	7/13 at 100.00	AA–	2,597,625
	5.000%, 7/01/23 – AMBAC Insured
1,000	Clark County, Nevada, Passenger Facility Charge Revenue Bonds, Las Vegas-McCarran	1/20 at 100.00	Aa3	975,340
	International Airport, Series 2010A, 5.250%, 7/01/42
	Director of Nevada State Department of Business and Industry, Revenue Bonds, Las Vegas
	Monorail Project, First Tier, Series 2000:
2,360	0.000%, 1/01/21 – AMBAC Insured	No Opt. Call	D	338,943
4,070	0.000%, 1/01/22 – AMBAC Insured	No Opt. Call	D	548,677
6,025	5.375%, 1/01/40 – AMBAC Insured (5)	1/12 at 100.00	N/R	1,447,085
1,500	Las Vegas Redevelopment Agency, Nevada, Tax Increment Revenue Bonds, Series 2009A,	6/19 at 100.00	A	1,696,695
	8.000%, 6/15/30
1,515	Reno, Nevada, Capital Improvement Revenue Bonds, Series 2002, 5.500%, 6/01/21 – FGIC Insured	6/12 at 100.00	A	1,528,832
2,555	Reno, Nevada, Capital Improvement Revenue Bonds, Series 2002, 5.500%, 6/01/21 (Pre-refunded	6/12 at 100.00	A3 (4)	2,677,410
	6/01/12) – FGIC Insured
21,525	Total Nevada			11,810,607
	New Hampshire – 0.1%
325	New Hampshire Housing Finance Authority, Single Family Mortgage Acquisition Bonds, Series	11/11 at 100.00	Aa2	336,885
	2001A, 5.600%, 7/01/21 (Alternative Minimum Tax)
	New Jersey – 2.6%
2,500	New Jersey Health Care Facilities Financing Authority, Revenue Bonds, Somerset Medical Center,	7/13 at 100.00	Ba2	2,184,125
	Series 2003, 5.500%, 7/01/23
	Tobacco Settlement Financing Corporation, New Jersey, Tobacco Settlement Asset-Backed Bonds,
	Series 2002:
1,010	5.750%, 6/01/32 (Pre-refunded 6/01/12)	6/12 at 100.00	AAA	1,060,359
1,000	6.000%, 6/01/37 (Pre-refunded 6/01/12)	6/12 at 100.00	AAA	1,052,920
2,500	Tobacco Settlement Financing Corporation, New Jersey, Tobacco Settlement Asset-Backed Bonds,	6/17 at 100.00	Baa3	1,712,500
	Series 2007-1A, 5.000%, 6/01/41
7,010	Total New Jersey			6,009,904
	New Mexico – 2.2%
1,000	New Mexico Mortgage Finance Authority, Multifamily Housing Revenue Bonds, St Anthony, Series	9/17 at 100.00	N/R	920,100
	2007A, 5.250%, 9/01/42 (Alternative Minimum Tax)
4,000	University of New Mexico, FHA-Insured Mortgage Hospital Revenue Bonds, Series 2004, 4.625%,	7/14 at 100.00	AA+	4,050,880
	7/01/25 – AGM Insured
5,000	Total New Mexico			4,970,980
	New York – 0.7%
1,000	Dormitory Authority of the State of New York, FHA-Insured Mortgage Revenue Bonds, Kaleida	2/14 at 100.00	AAA	1,016,520
	Health, Series 2004, 5.050%, 2/15/25
530	Port Authority of New York and New Jersey, Special Project Bonds, JFK International Air	12/20 at 100.00	BBB–	537,505
	Terminal LLC Project, Eighth Series 2010, 6.000%, 12/01/42
1,530	Total New York			1,554,025
	North Carolina – 1.1%
1,000	North Carolina Eastern Municipal Power Agency, Power System Revenue Bonds, Series 2008C,	1/19 at 100.00	A–	1,176,020
	6.750%, 1/01/24
1,420	North Carolina Eastern Municipal Power Agency, Power System Revenue Refunding Bonds, Series	7/11 at 100.00	A–	1,422,158
	1993B, 5.500%, 1/01/21
2,420	Total North Carolina			2,598,178
	Ohio – 0.5%
1,545	Buckeye Tobacco Settlement Financing Authority, Ohio, Tobacco Settlement Asset-Backed Revenue	6/17 at 100.00	Baa3	1,156,757
	Bonds, Senior Lien, Series 2007A-2, 6.000%, 6/01/42
	Oklahoma – 2.1%
1,000	Norman Regional Hospital Authority, Oklahoma, Hospital Revenue Bonds, Series 2005,	9/16 at 100.00	BB+	837,670
	5.375%, 9/01/36
4,000	Oklahoma Development Finance Authority, Revenue Bonds, St. John Health System, Series 2004,	2/14 at 100.00	A	4,066,120
	5.000%, 2/15/24
5,000	Total Oklahoma			4,903,790
	Pennsylvania – 0.9%
500	Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, Widener University,	7/13 at 100.00	BBB+	507,715
	Series 2003, 5.250%, 7/15/24
1,000	Pennsylvania Turnpike Commission, Motor License Fund-Enhanced Subordinate Special Revenue	No Opt. Call	Aa3	766,790
	Bonds, Series 2010B-2, 0.000%, 12/01/30
700	Pennsylvania Turnpike Commission, Turnpike Revenue Bonds, Series 2004A, 5.500%, 12/01/31 –	12/14 at 100.00	Aa3	718,851
	AMBAC Insured
2,200	Total Pennsylvania			1,993,356
	Puerto Rico – 0.6%
1,000	Puerto Rico Sales Tax Financing Corporation, Sales Tax Revenue Bonds, First Subordinate Series	8/19 at 100.00	A+	1,043,490
	2009A, 6.000%, 8/01/42
7,000	Puerto Rico Sales Tax Financing Corporation, Sales Tax Revenue Bonds, Series 2007A, 0.000%,	No Opt. Call	Aa2	379,610
	8/01/54 – AMBAC Insured
8,000	Total Puerto Rico			1,423,100
	South Carolina – 7.2%
1,250	Dorchester County School District 2, South Carolina, Installment Purchase Revenue Bonds,	12/14 at 100.00	AA–	1,363,463
	GROWTH, Series 2004, 5.250%, 12/01/20
10,000	Greenville County School District, South Carolina, Installment Purchase Revenue Bonds, Series	12/12 at 101.00	AA (4)	10,890,396
	2002, 5.875%, 12/01/19 (Pre-refunded 12/01/12)
1,500	Lexington County Health Service District, South Carolina, Hospital Revenue Refunding and	11/13 at 100.00	AA– (4)	1,692,900
	Improvement Bonds, Series 2003, 6.000%, 11/01/18 (Pre-refunded 11/01/13)
520	South Carolina JOBS Economic Development Authority, Economic Development Revenue Bonds, Bon	11/12 at 100.00	A3 (4)	557,851
	Secours Health System Inc., Series 2002A, 5.625%, 11/15/30 (Pre-refunded 11/15/12)
1,980	South Carolina JOBS Economic Development Authority, Economic Development Revenue Bonds, Bon	11/12 at 100.00	A–	1,978,693
	Secours Health System Inc., Series 2002B, 5.625%, 11/15/30
15,250	Total South Carolina			16,483,303
	Texas – 8.6%
5,000	Brazos River Harbor Navigation District, Brazoria County, Texas, Environmental Facilities	5/12 at 101.00	BBB	5,133,350
	Revenue Bonds, Dow Chemical Company Project, Series 2002A-6, 6.250%, 5/15/33 (Mandatory
	put 5/15/17) (Alternative Minimum Tax)
250	Central Texas Regional Mobility Authority, Senior Lien Revenue Bonds, Series 2011,	1/21 at 100.00	BBB–	247,950
	6.000%, 1/01/41
500	Central Texas Regional Mobility Authority, Travis and Williamson Counties, Toll Road Revenue	1/15 at 100.00	BBB	429,020
	Bonds, Series 2005, 5.000%, 1/01/35 – FGIC Insured
360	Dallas-Fort Worth International Airport Public Facility Corporation, Texas, Airport Hotel	7/11 at 100.00	AA+	360,500
	Revenue Bonds, Series 2001, 5.500%, 1/15/20 – AGM Insured
2,300	Harris County Health Facilities Development Corporation, Texas, Thermal Utility Revenue Bonds,	11/13 at 100.00	AA	2,317,020
	TECO Project, Series 2003, 5.000%, 11/15/30 – NPFG Insured
1,750	Harris County-Houston Sports Authority, Texas, Junior Lien Revenue Bonds, Series 2001H,	No Opt. Call	Baa1	438,690
	0.000%, 11/15/30 – NPFG Insured
3,805	Harris County-Houston Sports Authority, Texas, Revenue Bonds, Third Lien Series 2004-A3,	11/24 at 52.47	Baa1	623,449
	0.000%, 11/15/35 – NPFG Insured
3,470	Harris County-Houston Sports Authority, Texas, Senior Lien Revenue Refunding Bonds, Series	11/30 at 61.17	Baa1	497,841
	2001A, 0.000%, 11/15/38 – NPFG Insured
45	Irving Independent School District, Dallas County, Texas, General Obligation Refunding Bonds,	2/12 at 100.00	AAA	45,816
	Series 2002A, 5.000%, 2/15/31
3,455	Irving Independent School District, Dallas County, Texas, General Obligation Refunding Bonds,	2/12 at 100.00	AAA	3,559,203
	Series 2002A, 5.000%, 2/15/31 (Pre-refunded 2/15/12)
1,780	Leander Independent School District, Williamson and Travis Counties, Texas, General Obligation	8/16 at 35.23	AAA	411,732
	Bonds, Series 2007, 0.000%, 8/15/37
2,000	North Texas Tollway Authority, First Tier System Revenue Refunding Bonds, Capital Appreciation	1/25 at 100.00	A2	1,656,140
	Series 2008I, 0.000%, 1/01/43
2,000	Richardson Hospital Authority, Texas, Revenue Bonds, Richardson Regional Medical Center,	12/13 at 100.00	Baa2	1,958,040
	Series 2004, 6.000%, 12/01/34
240	San Antonio, Texas, Water System Revenue Refunding Bonds, Series 1992, 6.000%, 5/15/16	5/12 at 100.00	Aa3 (4)	250,133
	(Pre-refunded 5/15/12) – NPFG Insured
1,750	Texas, General Obligation Bonds, Water Financial Assistance Program, Series 2003A, 5.125%,	8/13 at 100.00	Aaa	1,689,293
	8/01/42 (Alternative Minimum Tax)
28,705	Total Texas			19,618,177
	Utah – 0.3%
775	Utah State Building Ownership Authority, Lease Revenue Bonds, State Facilities Master Lease	11/11 at 100.00	AA+ (4)	789,485
	Program, Series 2001B, 5.250%, 5/15/24 (Pre-refunded 11/15/11)
	Virginia – 1.3%
1,000	Fairfax County Economic Development Authority, Virginia, Residential Care Facilities Mortgage	10/17 at 100.00	N/R	887,300
	Revenue Bonds, Goodwin House, Inc., Series 2007A, 5.125%, 10/01/42
1,000	Henrico County Economic Development Authority, Virginia, Residential Care Facility Revenue	No Opt. Call	BBB	879,920
	Bonds, Westminster Canterbury of Richmond, Series 2006, 5.000%, 10/01/35
2,000	Metropolitan Washington DC Airports Authority, Virginia, Dulles Toll Road Revenue Bonds,	10/28 at 100.00	BBB+	1,255,200
	Dulles Metrorail Capital Appreciation, Series 2010B, 0.000%, 10/01/44
4,000	Total Virginia			3,022,420
	Washington – 6.8%
250	Energy Northwest, Washington, Electric Revenue Refunding Bonds, Columbia Generating Station,	7/12 at 100.00	Aaa	261,688
	Series 2002A, 5.500%, 7/01/17 – NPFG Insured
1,330	Snohomish County Public Utility District 1, Washington, Generation System Revenue Bonds,	No Opt. Call	Aaa	1,367,400
	Series 1989, 6.750%, 1/01/12 (ETM)
990	Washington State Health Care Facilities Authority, Revenue Bonds, Fred Hutchinson Cancer	1/21 at 100.00	A	974,150
	Research Center, Series 2011A, 5.625%, 1/01/35
9,750	Washington State Health Care Facilities Authority, Revenue Bonds, Sisters of Providence Health	10/11 at 100.00	AA	9,838,042
	System, Series 2001A, 5.125%, 10/01/17 – NPFG Insured
2,000	Washington State Tobacco Settlement Authority, Tobacco Settlement Asset-Backed Revenue Bonds,	6/13 at 100.00	BBB	2,029,560
	Series 2002, 6.500%, 6/01/26
2,115	Washington State, Motor Vehicle Fuel Tax General Obligation Bonds, Series 2003F, 0.000%,	No Opt. Call	AA+	992,718
	12/01/27 – NPFG Insured
16,435	Total Washington			15,463,558
	West Virginia – 0.2%
500	West Virginia Hospital Finance Authority, Revenue Bonds, United Hospital Center Inc. Project,	6/16 at 100.00	A+	467,415
	Series 2006A, 4.500%, 6/01/26 – AMBAC Insured
	Wisconsin – 1.8%
470	Badger Tobacco Asset Securitization Corporation, Wisconsin, Tobacco Settlement Asset-Backed	6/12 at 100.00	AAA	490,309
	Bonds, Series 2002, 6.125%, 6/01/27 (Pre-refunded 6/01/12)
1,000	Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Wheaton Franciscan	8/13 at 100.00	BBB+	1,033,930
	Services Inc., Series 2003A, 5.500%, 8/15/17
2,500	Wisconsin, General Obligation Refunding Bonds, Series 2003-3, 5.000%, 11/01/26	11/13 at 100.00	AA	2,570,550
3,970	Total Wisconsin			4,094,789
$ 294,575	Total Municipal Bonds (cost $227,046,147)			225,614,027

Shares	Description			Value
	Common Stocks – 0.0%
	Airlines – 0.0%
122	United Continental Holdings Inc. (6), (7)			$ 2,761
	Total Common Stocks (cost $0)			2,761
	Total Investments (Cost $227,046,147) – 98.6%			225,616,788
	Other Assets Less Liabilities – 1.4%			3,194,603
	Net Assets – 100%			$ 228,811,391

Fair Value Measurements

Fair value is defined as the price that the Fund would receive upon selling an investment or transferring a liability in an orderly transaction to an independent buyer in the principal or most advantageous market for the investment. A three-tier hierarchy is used to maximize the use of observable market data and minimize the use of unobservable inputs and to establish classification of fair value measurements for disclosure purposes. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability. Observable inputs are based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability. Unobservable inputs are based on the best information available in the circumstances. The three-tier hierarchy of inputs is summarized in the three broad levels listed below:

Level 1 – Quoted prices in active markets for identical securities.

Level 2 – Other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).

Level 3 – Significant unobservable inputs (including management's assumptions in determining the fair value of investments).

The inputs or methodologies used for valuing securities are not an indication of the risk associated with investing in those securities. The following is a summary of the Fund's fair value measurements as of June 30, 2011:


	Level 1		Level 2		Level 3		Total
Investments:
Municipal Bonds	$	—	$	225,614,027	$	—	$	225,614,027
Common Stocks		2,761		—		—		2,761
Total	$	2,761	$	225,614,027	$	—	$	225,616,788

During the period ended June 30, 2011, the Fund recognized no significant transfers to or from Level 1, Level 2 or Level 3.

Income Tax Information

The following information is presented on an income tax basis. Differences between amounts for financial statement and federal income tax purposes are primarily due to timing differences in recognizing taxable market discount, timing differences in recognizing certain gains and losses on investment transactions and the treatment of investments in inverse floating rate securities reflected as financing transactions, if any. To the extent that differences arise that are permanent in nature, such amounts are reclassified within the capital accounts on the Statement of Assets and Liabilities presented in the annual report, based on their federal tax basis treatment; temporary differences do not require reclassification. Temporary and permanent differences do not impact the net asset value of the Fund.

At June 30, 2011, the cost of investments was $226,522,369.

Gross unrealized appreciation and gross unrealized depreciation of investments at June 30, 2011, were as follows:


Gross unrealized:
Appreciation	$	11,667,653
Depreciation		(12,573,234	)
Net unrealized appreciation (depreciation) of investments	$	(905,581	)

(1)	All percentages shown in the Portfolio of Investments are based on net assets.
(2)	Optional Call Provisions: Dates (month and year) and prices of the earliest optional call or redemption. There may be other call provisions at varying prices at later dates. Certain mortgage-backed securities may be subject to periodic principal paydowns.
(3)	Ratings: Using the highest of Standard & Poor’s Group (“Standard & Poor’s”), Moody’s Investor Service, Inc. (“Moody’s”) or Fitch, Inc. (“Fitch”) rating. Ratings below BBB by Standard & Poor’s, Baa by Moody’s or BBB by Fitch are considered to be below investment grade. Holdings designated N/R are not rated by any of these national rating agencies.
(4)	Backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency securities, which ensure the timely payment of principal and interest. Such investments are normally considered to be equivalent to AAA rated securities.
(5)	At or subsequent to the end of the reporting period, this security is non-income producing. Non-income producing security, in the case of a bond, generally denotes that the issuer has (1) defaulted on the payment of principal or interest, (2) is under the protection of the Federal Bankruptcy Court or (3) the Fund’s Adviser has concluded that the issue is not likely to meet its future interest payment obligations and has directed the Fund’s custodian to cease accruing additional income on the Fund’s records.

(6)

On December 9, 2002, UAL Corporation (“UAL”), the holding company of United Air Lines, Inc. (“United”) filed for federal bankruptcy protection. The Adviser determined that it was likely that United would not remain current on their interest payment obligations with respect to the bonds previously held and thus the Fund had stopped accruing interest on its UAL bonds. On February 1, 2006, UAL emerged from federal bankruptcy with the acceptance of its reorganization plan by the bankruptcy court. Under the settlement agreement established to meet UAL’s unsecured bond obligations, the bondholders, including the Fund, received three distributions of UAL common stock over the subsequent months, and the bankruptcy court dismissed all unsecured claims of bondholders, including those of the Fund. On May 5, 2006, the Fund liquidated such UAL common stock holdings. On September 29, 2006 and May 30, 2007, the Fund received additional distributions of 1,901 and 617 shares, respectively, of UAL common stock as a result of its earlier ownership of the UAL bonds. The Fund liquidated the 1,901 shares of such UAL common stock holdings on November 15, 2006. The Fund received an additional distribution of 172 UAL common stock shares on November 14, 2007. The remaining 789 shares of UAL common stock were liquidated by the Fund on March 30, 2010. The Fund received an additional distribution of 122 UAL common stock shares on July 20, 2010, which are still held by the Fund as of June 30, 2011. On October 1, 2010, UAL Corporation was renamed United Continental Holdings, Inc.

(7)

Non-income producing; issuer has not declared a dividend within the past twelve months.

N/R	Not rated.
(ETM)	Escrowed to maturity.
(IF)	Inverse floating rate investment.

Item 2. Controls and Procedures.

The registrant's principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act") (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934 (17 CFR 240.13a-15(b) or 240.15d-15(b)).

There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting.

Item 3. Exhibits.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)), exactly as set forth below: See EX-99 CERT attached hereto.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant) Nuveen Select Tax-Free Income Portfolio

By (Signature and Title) /s/ Kevin J. McCarthy

Kevin J. McCarthy

Vice President and Secretary

Date August 29, 2011

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By (Signature and Title) /s/ Gifford R. Zimmerman

Gifford R. Zimmerman

Chief Administrative Officer (principal executive officer)

Date August 29, 2011

By (Signature and Title) /s/ Stephen D. Foy

Stephen D. Foy

Vice President and Controller (principal financial officer)

Date August 29, 2011