Illinois’s 15th Congressional District is represented by Mary E. Miller (R) in the U.S. House of Representatives. The district is one of Illinois’s seats in the 435-member House of Representatives. After the 2020 Census, the average congressional district had 761,169 people, according to the U.S. Census Bureau, and these district boundaries were drawn during the redistricting cycle that followed.
Congressional representatives serve two-year terms and face election every even-numbered year. The next election for this seat will take place on November 3, 2026.
Population
749,694
Median Household Income
$71,893
Population and income: U.S. Census Bureau, American Community Survey 5-year estimates for 2019 to 2023, for district lines in effect on January 1, 2023.
Partisan Lean
R+40
2024 presidential margin (Trump vs Harris). Source: The Downballot.
District boundary, 119th Congress. Boundary data: U.S. Census Bureau TIGERweb. Map tiles: OpenStreetMap.
Mary E. Miller and Illinois's 15th Congressional District
Mary E. Miller, a member of the Republican Party, represents Illinois's 15th Congressional District and has held the seat since January 3, 2021. The boundary map for the district is above and the ZIP codes it covers are listed further down this page.
Committee assignments: House Committee on Agriculture, House Committee on Education and Workforce, House Committee on House Administration and Joint Committee on Printing.
The current term ends January 3, 2027. The seat is on the ballot on Tuesday, November 3, 2026. Washington office phone: 202-225-5271. Official site: marymiller.house.gov.
Current Representative
Rep. Mary E. Miller (R)
119th Congress • Republican • Representing this district since January 3, 2021
Mary E. Miller currently represents Illinois’s 15th Congressional District as a member of the Republican Party in the United States House of Representatives. The representative’s district office helps constituents with federal casework, such as Social Security claims and veterans’ benefits.
2026 Election
On the ballot November 3, 2026
- Jennifer Todd, Democratic
- Mary E. Miller, Republican Incumbent
Source: Illinois State Board of Elections, general election candidate list, checked September 26, 2026. Write-in candidates are not listed.
Key dates for November 3, 2026
| Register by mail | Tuesday, October 6 Application must be postmarked by this date. |
|---|---|
| Register online | Sunday, October 18 |
| Register in person | Through Election Day, November 3 |
| Same-day registration | Grace-period registration and voting run through Election Day at early voting sites and polling places. |
| Early in-person voting | September 24 to November 2 Open nowSites and hours vary by election authority. |
| Request a mail ballot | Thursday, October 29 Mailed requests must be received by October 29. In-person requests are accepted until November 2. |
| Return a mail ballot | Postmarked by November 3 and received by November 17. Ballots delivered by hand or to a drop box are due by 7 p.m. on November 3. |
| Election Day | Tuesday, November 3, 2026 |
Check your registration with the Illinois voter lookup. Dates come from the Illinois election office and were checked September 26, 2026. States can change deadlines, so confirm with your election office before you act.
Polling places in Illinois are open 6 a.m. to 7 p.m., local time. Confirm your registration and polling place on the official federal voter page for Illinois: vote.gov.
What is on the ballot nationally on November 3, 2026
Contact Your Representative
Washington Office
1740 Longworth House Office Building
Washington, DC 20515
Phone: (202) 225-5271
Online
Committee Assignments
- House Committee on Agriculture
- House Committee on Education and Workforce
- House Committee on House Administration
- Joint Committee on Printing
About This District
The district spans 35 counties in Illinois, including Pike, Adams, Henderson, Greene, and Hancock, and others. Its largest cities are Quincy (about 39,000), Godfrey (about 18,000), Jacksonville (about 18,000), and Charleston (about 17,000).
This page covers Illinois 15th District, including its current U.S. House representative, district map, ZIP codes, and 2026 election details.
Learn more about congressional districts
- What is a congressional district?
- What does a U.S. Representative do?
- What is gerrymandering?
- How congressional redistricting works
Frequently Asked Questions
Who represents Illinois's 15th Congressional District?
Mary E. Miller (R) represents Illinois's 15th Congressional District in the U.S. House of Representatives.
What political party is Mary E. Miller a member of?
Mary E. Miller is a member of the Republican Party.
How can I contact Mary E. Miller?
You can reach Mary E. Miller by phone at 202-225-5271 or through their official website at https://marymiller.house.gov.
When does Mary E. Miller's current term end?
Mary E. Miller's current term in the U.S. House of Representatives ends on January 3, 2027.
Where is Illinois's 15th Congressional District?
Illinois's 15th Congressional District is located in the state of Illinois and is one of the 435 voting congressional districts in the U.S. House of Representatives.
What district does Mary E. Miller represent?
Mary E. Miller has represented Illinois's 15th Congressional District since January 3, 2021. The boundary map for the district is on this page.
Where can I see a map of Mary E. Miller's district?
The boundary map for Illinois's 15th Congressional District is on this page. It is drawn from U.S. Census Bureau TIGERweb boundary files for the 119th Congress.
What committees is Mary E. Miller on?
Mary E. Miller sits on House Committee on Agriculture, House Committee on Education and Workforce, House Committee on House Administration and Joint Committee on Printing. Committee assignments come from the Clerk of the House MemberData file.
Is Mary E. Miller still in Congress?
This site shows Mary E. Miller holding Illinois's 15th Congressional District, checked against the Clerk of the House member list. All 435 House seats are on the ballot on November 3, 2026, so the answer can change with that election.
Nearby Districts in Illinois
ZIP Codes in Illinois's 15th Congressional District
This congressional district contains 415 ZIP codes. The most common 10 are shown below; expand the full list to see every ZIP in the district.
202 of these ZIP codes also extend into another Illinois district, so a ZIP code here does not always identify a single representative. Examples include 60936 (also in the 2nd and 16th), 60949 (also in the 2nd), 60957 (also in the 2nd), 60960 (also in the 2nd), 61231 (also in the 17th), 61259 (also in the 17th), 61262 (also in the 16th and 17th), 61263 (also in the 17th).
- 60936
- 60949
- 60957
- 60960
- 61231
- 61259
- 61260
- 61262
- 61263
- 61264
View all 415 ZIP codes in this district
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ZIP-to-district boundaries sourced from the U.S. Census Bureau's 2024-07-30 Block Equivalency File for the 119th Congress. ZCTAs (ZIP Code Tabulation Areas) approximate USPS delivery ZIPs.
U.S. Senators for this state: Richard J. Durbin (D), Tammy Duckworth (D)
Last updated September 27, 2026.
Data last checked September 26, 2026.
See how this district compares with another using Compare Districts.