Nuveen Select Tax-Free Income Portfolio

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)


        333 West Wacker Drive, Chicago, Illinois 60606         

(Address of principal executive offices) (Zip code)


Jessica R. Droeger—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:            09/30          

Date of reporting period:          12/31/04         

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)
December 31, 2004


Principal

Optional Call

Market

Amount (000)

Description

Provisions*

Ratings**

Value


Alaska - 1.1%

 

$

2,475

Alaska Municipal Bond Bank Authority, General Obligation Bonds, Series 2003E, 5.250%, 12/01/23 -

12/13 at 100.00

AAA

$    2,696,884

   MBIA Insured


California - 4.6%

 

2,000

Alameda Corridor Transportation Authority, California, Subordinate Lien Revenue Bonds, Series

10/17 at 100.00

AAA

1,424,380

   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

A2

3,867,973

   5/01/14

 

1,450

California Statewide Community Development Authority, Certificates of Participation, Cedars-Sinai

2/05 at 100.00

A3

1,454,408

   Medical Center, Series 1992, 6.500%, 8/01/15

 

200

Contra Costa County, California, Certificates of Participation Refunding, Merrithew Memorial

11/07 at 102.00

AAA

218,516

   Hospital Replacement Project, Series 1997, 5.375%, 11/01/17 - MBIA Insured

 

3,000

Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed Bonds,

6/13 at 100.00

BBB

3,004,530

   Series 2003A-1, 6.750%, 6/01/39

 

1,130

Los Angeles Department of Water and Power, California, Waterworks Revenue Refunding Bonds, Series

7/11 at 100.00

AAA

1,153,775

   2001A, 5.125%, 7/01/41 - FGIC Insured


Colorado - 13.6%

 

Colorado Health Facilities Authority, Revenue Bonds, Catholic Health Initiatives, Series 2002A:

1,700

   5.500%, 3/01/22

3/12 at 100.00

AA***

1,913,741

1,300

   5.500%, 3/01/22

3/12 at 100.00

AA

1,415,570

 

1,000

Colorado Water Resources and Power Development Authority, Small Water Resources Revenue Bonds,

11/10 at 100.00

AAA

1,127,100

   Series 2000A, 5.800%, 11/01/20 - FGIC Insured

 

5,000

Denver City and County, Colorado, Airport System Revenue Refunding Bonds, Series 2001A, 5.625%,

11/11 at 100.00

AAA

5,510,550

   11/15/17 (Alternative Minimum Tax) - FGIC Insured

 

10,750

Denver City and County, Colorado, Airport System Revenue Bonds, Series 1991D, 7.750%, 11/15/13

No Opt. Call

A

13,037,600

   (Alternative Minimum Tax)

 

640

Denver City and County, Colorado, Airport System Revenue Bonds, Series 1996A, 5.500%, 11/15/25 -

11/06 at 101.00

AAA

674,746

   MBIA Insured

 

230

Denver City and County, Colorado, Airport System Revenue Bonds, Series 1996D, 5.500%, 11/15/25 -

11/06 at 101.00

AAA

242,487

   MBIA Insured

 

Denver Convention Center Hotel Authority, Colorado, Senior Revenue Bonds, Convention Center Hotel,

Series 2003A:

1,000

   5.000%, 12/01/22 - XLCA Insured

12/13 at 100.00

AAA

1,050,980

3,000

   5.000%, 12/01/23 - XLCA Insured

12/13 at 100.00

AAA

3,141,600

 

5,000

E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 2000B, 0.000%, 9/01/28

9/10 at 31.42

AAA

1,295,100

   (Pre-refunded to 9/01/10) - MBIA Insured

 

3,160

Northwest Parkway Public Highway Authority, Colorado, Revenue Bonds, Senior Series 2001A, 5.500%,

6/11 at 102.00

AAA

3,531,679

   6/15/20 - AMBAC Insured


District of Columbia - 0.6%

 

1,000

District of Columbia, Hospital Revenue Refunding Bonds, Medlantic Healthcare Group, Series 1996A,

8/06 at 102.00

AAA

1,069,190

   5.750%, 8/15/16 - MBIA Insured

 

265

District of Columbia, Revenue Bonds, Catholic University of America, Series 1999, 5.625%, 10/01/29 -

10/09 at 101.00

AAA

291,556

   AMBAC Insured


Florida - 7.1%

 

450

Escambia County, Florida, Pollution Control Revenue Bonds, Champion International Corporation,

6/05 at 101.00

BBB

452,363

   Series 1993, 5.875%, 6/01/22 (Alternative Minimum Tax)

 

10,000

JEA St. John's River Power Park System, Florida, Revenue Refunding Bonds, Series 2002-17 Issue 2,

10/11 at 100.00

Aa2

10,732,000

   5.000%, 10/01/17

 

6,100

JEA St. John's River Power Park System, Florida, Revenue Refunding Bonds, Issue Two, Series Nine,

4/05 at 100.00

Aa2

6,110,126

   5.250%, 10/01/21


Hawaii - 0.6%

 

1,330

Hawaii, Certificates of Participation, Kapolei State Office Building, Series 1998A, 5.000%,

11/08 at 101.00

AAA

1,426,146

   5/01/17 - AMBAC Insured


Illinois - 15.4%

 

Chicago Heights, Illinois, General Obligation Corporate Purpose Bonds, Series 1993:

3,820

   5.650%, 12/01/15 - FGIC Insured

12/08 at 100.00

AAA

4,229,313

2,600

   5.650%, 12/01/17 - FGIC Insured

12/08 at 100.00

AAA

2,873,520

 

2,500

Chicago, Illinois, Special Facility Revenue Refunding Bonds, O'Hare International Airport, United

No Opt. Call

N/R

525,000

   Air Lines Inc. Project, Series 2001C, 6.300%, 5/01/16#

 

1,000

DuPage County Community School District 200, Wheaton, Illinois, General Obligation Bonds, Series

11/13 at 100.00

Aaa

1,095,310

   2003B, 5.250%, 11/01/20 - FSA Insured

 

1,000

Illinois Educational Facilities Authority, Revenue Bonds, Midwestern University, Series 1998B,

5/08 at 101.00

A

1,042,550

   5.500%, 5/15/18 - ACA Insured

 

4,000

Illinois Finance Authority, Revenue Bonds, Northwestern Memorial Hospital, Series 2004A, 5.500%,

8/14 at 100.00

AA+

4,179,960

   8/15/43

 

1,960

Illinois Health Facilities Authority, Revenue Refunding Bonds, Evangelical Hospitals Corporation,

No Opt. Call

N/R***

2,103,688

   Series 1992B, 6.500%, 4/15/09

 

300

Illinois Health Facilities Authority, Revenue Bonds, Rush-Presbyterian St. Luke's Medical Center

5/05 at 101.00

AAA

303,480

   Obligated Group, Series 1993, 5.250%, 11/15/20 - MBIA Insured

 

1,320

Illinois Health Facilities Authority, Revenue Bonds, Decatur Memorial Hospital, Series 2001,

10/11 at 100.00

A

1,410,354

   5.600%, 10/01/16

 

2,700

Illinois Health Facilities Authority, Revenue Bonds, Lake Forest Hospital, Series 2002A, 6.000%,

7/12 at 100.00

A-

3,008,070

   7/01/17

 

2,275

Illinois Health Facilities Authority, Revenue Refunding Bonds, Elmhurst Memorial Healthcare, Series

1/13 at 100.00

A2

2,561,969

   2002, 6.250%, 1/01/17

 

800

Illinois Housing Development Authority, Homeowner Mortgage Revenue Bonds, Series 2000D-3, 5.700%,

2/10 at 100.00

AA

856,576

   8/01/17

 

1,500

Illinois Housing Development Authority, Homeowner Mortgage Revenue Bonds, Series 1999G-1, 5.700%,

7/10 at 100.00

AA

1,613,895

   8/01/17

 

600

Illinois Educational Facilities Authority, Student Housing Revenue Bonds, Educational Advancement

5/12 at 101.00

Baa2

641,910

   Foundation Fund, University Center Project, Series 2002, 6.000%, 5/01/22

 

3,125

Metropolitan Pier and Exposition Authority, Illinois, Revenue Bonds, McCormick Place Expansion

No Opt. Call

AAA

1,797,438

   Project, Series 1992A, 0.000%, 6/15/17 - FGIC Insured

 

5,000

Metropolitan Pier and Exposition Authority, Illinois, Revenue Refunding Bonds, McCormick Place

6/12 at 101.00

AAA

5,291,250

   Expansion Project, Series 2002B, 5.000%, 6/15/21 - MBIA Insured

 

1,300

Schaumburg, Illinois, General Obligation Bonds, Series 2004B, 5.250%, 12/01/34 - FGIC Insured

12/14 at 100.00

AAA

1,381,107

 

Yorkville, Illinois, General Obligation Debt Certificates, Series 2003:

1,000

   5.000%, 12/15/19 - RAAI Insured

12/11 at 100.00

AA

1,035,600

1,000

   5.000%, 12/15/20 - RAAI Insured

12/11 at 100.00

AA

1,031,360


Indiana - 8.0%

 

5,000

Duneland School Building Corporation, Indiana, First Mortgage Refunding Bonds, Series 1999,

2/09 at 101.00

AAA

5,394,700

   5.125%, 2/01/18 - MBIA Insured

 

1,000

Franklin Community Multi-School Building Corporation, Marion County, Indiana, First Mortgage

7/14 at 100.00

AAA

1,059,500

   Revenue Bonds, Series 2004, 5.000%, 7/15/22 - FGIC Insured

 

2,000

Indiana Health Facility Financing Authority, Hospital Revenue Refunding Bonds, Columbus Regional

No Opt. Call

AAA

2,460,900

   Hospital, Series 1993, 7.000%, 8/15/15 - FSA Insured

 

9,855

Indianapolis Local Public Improvement Bond Bank, Indiana, Waterworks Project, Series 2002A,

7/12 at 100.00

AAA

10,493,703

   5.125%, 7/01/21 - MBIA Insured


Kansas - 0.3%

 

750

Wamego, Kansas, Pollution Control Revenue Bonds, Kansas Gas and Electric Company, Series 2004,

6/14 at 100.00

AAA

798,990

   5.300%, 6/01/31 - MBIA Insured


Kentucky - 0.5%

 

1,100

Jefferson County, Kentucky, Health System Revenue Bonds, Alliant Health System Inc., Series 1998,

10/08 at 101.00

AAA

1,157,805

   5.125%, 10/01/18 - MBIA Insured


Louisiana - 0.4%

 

1,000

Tobacco Settlement Financing Corporation, Louisiana, Tobacco Settlement Asset-Backed Bonds, Series

5/11 at 101.00

BBB

898,750

   2001B, 5.875%, 5/15/39


Massachusetts - 0.2%

 

500

Massachusetts Health and Educational Facilities Authority, Revenue Bonds, Partners HealthCare

7/11 at 101.00

AA-

566,435

   System Inc., Series 2001C, 6.000%, 7/01/17


Michigan - 1.9%

 

665

Detroit, Michigan, Second Lien Water Supply System Revenue Bonds, Series 1995A, 5.500%, 7/01/25

7/05 at 102.00

AAA

683,121

   (Pre-refunded to 7/01/05) - MBIA Insured

 

2,900

Michigan State Hospital Finance Authority, Revenue Refunding Bonds, Trinity Health Credit Group,

12/12 at 100.00

AA-

3,003,791

   Series 2002C, 5.375%, 12/01/30

 

1,000

Michigan State Hospital Finance Authority, Hospital Revenue Bonds, Detroit Medical Center Obligated

8/08 at 101.00

Ba3

867,900

   Group, Series 1998A, 5.125%, 8/15/18


Minnesota - 0.2%

 

465

Minnesota Housing Finance Agency, Single Family Mortgage Revenue Bonds, Series 1995A, 5.200%,

7/08 at 101.00

AA+

486,981

   1/01/17


Mississippi - 1.6%

 

3,600

Calhoun County, Mississippi, Solid Waste Disposal Revenue Bonds, Weyerhauser Company Project,

4/07 at 103.00

BBB

3,864,672

   Series 1992, 6.875%, 4/01/16 (Alternative Minimum Tax)


Nevada - 6.6%

 

2,500

Clark County, Nevada, Motor Vehicle Fuel Tax Highway Improvement Revenue Bonds, Series 2003,

7/13 at 100.00

AAA

2,624,400

   5.000%, 7/01/23 - AMBAC Insured

 

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

AAA

1,071,228

3,500

   0.000%, 1/01/22 - AMBAC Insured

No Opt. Call

AAA

1,495,200

6,025

   5.375%, 1/01/40 - AMBAC Insured

1/10 at 100.00

AAA

6,249,130

 

4,070

Reno, Nevada, Capital Improvement Revenue Bonds, Series 2002, 5.500%, 6/01/21 - FGIC Insured

6/12 at 100.00

AAA

4,529,259


New Hampshire - 0.3%

 

755

New Hampshire Housing Finance Agency, Single Family Mortgage Acquisition Bonds, Series 2001A,

5/11 at 100.00

Aa2

764,173

   5.600%, 7/01/21 (Alternative Minimum Tax)


New Jersey - 1.1%

 

2,500

New Jersey Health Care Facilities Financing Authority, Revenue Bonds, Somerset Medical Center,

7/13 at 100.00

Baa3

2,575,225

   Series 2003, 5.500%, 7/01/23


New Mexico - 1.7%

 

4,000

University of New Mexico, FHA-Insured Mortgage Hospital Revenue Bonds, Series 2004, 4.625%,

7/14 at 100.00

AAA

4,007,640

   7/01/25 - FSA Insured


New York - 1.3%

 

450

Long Island Power Authority, New York, Electric System General Revenue Bonds, Series 1998A,

6/08 at 101.00

AAA

483,215

   5.125%, 12/01/22 - FSA Insured

 

1,000

Dormitory Authority of the State of New York, FHA-Insured Mortgage Revenue Bonds, Kaleida Health,

2/14 at 100.00

AAA

1,040,800

   Series 2004, 5.050%, 2/15/25

 

1,600

Dormitory Authority of the State of New York, Revenue Bonds, Mount Sinai NYU Health Obligated

7/10 at 101.00

Ba1

1,696,288

   Group, Series 2000A, 6.500%, 7/01/17


North Carolina - 1.1%

 

2,195

North Carolina Eastern Municipal Power Agency, Power System Revenue Refunding Bonds, Series 1993B,

1/05 at 100.00

BBB

2,196,668

   5.500%, 1/01/21

 

500

Raleigh Durham Airport Authority, North Carolina, Airport Revenue Bonds, Series 2001A, 5.250%,

5/11 at 101.00

Aaa

547,040

   11/01/17 - FGIC Insured


Ohio - 0.6%

 

1,365

Ohio Housing Finance Agency, GNMA Mortgage-Backed Securities Program Residential Mortgage

9/07 at 102.00

Aaa

1,439,038

   Remarketed Revenue Bonds, Series 1997A-1, 6.050%, 9/01/17 (Alternative Minimum Tax)


Oklahoma - 1.7%

 

4,000

Oklahoma Development Finance Authority, Revenue Bonds, St. John Health System, Series 2004,

2/14 at 100.00

AA

4,113,400

   5.000%, 2/15/24


Pennsylvania - 0.5%

 

500

Pennsylvania Higher Educational Facilities Authority, Revenue Bonds, Widner University, Series

7/13 at 100.00

BBB+

520,755

   2003, 5.250%, 7/15/24

 

700

Pennsylvania Turnpike Commission, Turnpike Revenue Bonds, Series 2004A, 5.500%, 12/01/31 - AMBAC

12/14 at 100.00

AAA

766,913

   Insured


South Carolina - 7.1%

 

10,000

Greenville County School District, South Carolina, Installment Purchase Revenue Bonds, Series 2002,

12/12 at 101.00

AA-

11,261,800

   5.875%, 12/01/19

 

1,500

Lexington County Health Service District, South Carolina, Hospital Revenue Refunding and

11/13 at 100.00

A

1,679,460

   Improvement Bonds, Series 2003, 6.000%, 11/01/18

 

2,500

South Carolina JOBS Economic Development Authority, Economic Development Revenue Bonds, Bon Secours

11/12 at 100.00

A-

2,585,375

   Health System Inc., Series 2002A, 5.625%, 11/15/30

 

1,720

Tobacco Settlement Revenue Management Authority, South Carolina, Tobacco Settlement Asset-Backed

5/11 at 101.00

BBB

1,702,490

   Bonds, Series 2001B, 6.000%, 5/15/22


Texas - 8.6%

 

5,000

Brazos River Harbor Navigation District, Brazoria County, Texas, Environmental Facilities Revenue

5/12 at 101.00

A-

5,462,700

   Bonds, Dow Chemical Company Project, Series 2002A-6, 6.250%, 5/15/33 (Alternative Minimum Tax)

   (Mandatory put 5/15/17)

 

360

Dallas-Fort Worth International Airport Public Facility Corporation, Texas, Airport Hotel Revenue

1/09 at 100.00

AAA

388,019

   Bonds, Series 2001, 5.500%, 1/15/20 - FSA Insured

 

6,150

Dallas Independent School District, Dallas County, Texas, General Obligation Refunding Bonds,

2/12 at 100.00

AAA

6,673,611

   Series 2002, 5.250%, 2/15/20

 

2,300

Harris County Health Facilities Development Corporation, Texas, Thermal Utility Revenue Bonds, TECO

11/13 at 100.00

AAA

2,344,436

   Project, Series 2003, 5.000%, 11/15/30 - MBIA Insured

 

3,500

Irving Independent School District, Dallas County, Texas, General Obligation Refunding Bonds,

2/12 at 100.00

AAA

3,557,433

   Series 2002A, 5.000%, 2/15/31

 

San Antonio, Texas, Water System Revenue Refunding Bonds, Series 1992:

465

   6.000%, 5/15/16 - MBIA Insured

No Opt. Call

AAA

540,084

95

   6.000%, 5/15/16 (Pre-refunded to 5/15/07) - MBIA Insured

5/07 at 100.00

AAA

103,078

 

1,750

Texas, General Obligation Bonds, Water Financial Assistance Program, Series 2003A, 5.125%, 8/01/42

8/13 at 100.00

Aa1

1,766,253

   (Alternative Minimum Tax)


Washington - 9.5%

 

250

Energy Northwest, Washington, Electric Revenue Refunding Bonds, Columbia Generating Station, Series

7/12 at 100.00

AAA

279,065

   2002C, 5.500%, 7/01/17 - MBIA Insured

 

5,700

Snohomish County Public Utility District 1, Washington, Generation System Revenue Bonds, Series

1/05 at 100.00

Aaa

6,626,535

   1989, 6.750%, 1/01/12

 

2,535

Washington State Tobacco Settlement Authority, Tobacco Settlement Asset-Backed Revenue Bonds,

6/13 at 100.00

BBB

2,540,501

   Series 2002, 6.500%, 6/01/26

 

3,000

Washington State Healthcare Facilities Authority, Revenue Bonds, Catholic Health Initiatives,

12/07 at 101.00

AAA

3,212,460

   Series 1997A, 5.125%, 12/01/17 - MBIA Insured

 

9,750

Washington State Healthcare Facilities Authority, Revenue Bonds, Sisters of Providence Health

10/11 at 100.00

AAA

10,380,825

   System, Series 2001A, 5.125%, 10/01/17 - MBIA Insured


West Virginia - 0.9%

 

1,885

Marshall County, West Virginia, Special Obligation Refunding Bonds, Series 1992, 6.500%, 5/15/10

No Opt. Call

AAA

2,142,661


Wisconsin - 1.5%

 

2,500

Wisconsin, General Obligation Refunding Bonds, Series 2003-3, 5.000%, 11/01/26

11/13 at 100.00

AA-

2,600,300

 

1,000

Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Wheaton Franciscan Services

8/13 at 100.00

A

1,079,580

   Inc., Series 2003A, 5.500%, 8/15/17


$

233,120

Total Long-Term Investments (cost $224,243,156) - 98.6%

238,609,636



Other Assets Less Liabilities - 1.4%

3,304,418


Net Assets - 100%

$241,914,054


*  

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.

**  

Ratings: Using the higher of Standard & Poor's or Moody's rating.

***  

Securities are backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency

securities which ensures the timely payment of principal and interest. Such securities are normally considered

to be equivalent to AAA rated securities.

#  

On December 9, 2002, UAL Corporation, the holding company of United Air Lines, Inc. filed for federal

bankruptcy protection. The Adviser determined that it was likely United would not remain current on

their interest payment obligations with respect to these bonds and thus has stopped accruing interest.

N/R  

Investment is not rated.

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 income

on taxable market discount securities and timing differences in recognizing certain gains and losses on

security transactions.

At December 31, 2004, the cost of investments was $223,943,345.

Gross unrealized appreciation and gross unrealized depreciation of investments at December 31, 2004, were as

follows:


Gross unrealized:

   Appreciation

$16,748,173

   Depreciation

(2,081,882)


Net unrealized appreciation of investments

$14,666,291


Item 2. Controls and Procedures.

  1. 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)).
  2. 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: 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/ Jessica R. Droeger--Vice President and Secretary        

Date         02/28/05        

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--Chief Administrative Officer (principal executive officer)        

Date         02/28/05        

By (Signature and Title)*         /s/ Stephen D. Foy--Vice President and Controller (principal financial officer)        

Date         02/28/05        

* Print the name and title of each signing officer under his or her signature.