Illinois’s 6th Congressional District is represented by Sean Casten (D) 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
746,605
Median Household Income
$98,177
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
D+6
2024 presidential margin (Trump vs Harris). Source: The Downballot.
District boundary, 119th Congress. Boundary data: U.S. Census Bureau TIGERweb. Map tiles: OpenStreetMap.
Sean Casten and Illinois's 6th Congressional District
Sean Casten, a member of the Democratic Party, represents Illinois's 6th Congressional District and has held the seat since January 3, 2019. 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 Financial Services and Joint Economic Committee.
The current term ends January 3, 2027. The seat is on the ballot on Tuesday, November 3, 2026. Washington office phone: 202-225-4561. Official site: casten.house.gov.
Current Representative
Rep. Sean Casten (D)
119th Congress • Democrat • Representing this district since January 3, 2019
Sean Casten currently represents Illinois’s 6th Congressional District as a member of the Democratic 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
- Sean Casten, Democratic Incumbent
- Niki Conforti, Republican
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 PassedApplication must be postmarked by this date. |
|---|---|
| Register online | Sunday, October 18 Passed |
| 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
2440 Rayburn House Office Building
Washington, DC 20515
Phone: (202) 225-4561
Online
Committee Assignments
About This District
The district covers parts of DuPage and Cook counties in Illinois. Its largest cities are Orland Park (about 59,000), Oak Lawn (about 58,000), Tinley Park (about 56,000), and Downers Grove (about 50,000).
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 6th Congressional District?
Sean Casten (D) represents Illinois's 6th Congressional District in the U.S. House of Representatives.
What political party is Sean Casten a member of?
Sean Casten is a member of the Democratic Party.
How can I contact Sean Casten?
You can reach Sean Casten by phone at 202-225-4561 or through their official website at https://casten.house.gov.
When does Sean Casten's current term end?
Sean Casten's current term in the U.S. House of Representatives ends on January 3, 2027.
Where is Illinois's 6th Congressional District?
Illinois's 6th 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 Sean Casten represent?
Sean Casten has represented Illinois's 6th Congressional District since January 3, 2019. The boundary map for the district is on this page.
Where can I see a map of Sean Casten's district?
The boundary map for Illinois's 6th Congressional District is on this page. It is drawn from U.S. Census Bureau TIGERweb boundary files for the 119th Congress.
What committees is Sean Casten on?
Sean Casten sits on House Committee on Financial Services and Joint Economic Committee. Committee assignments come from the Clerk of the House MemberData file.
Is Sean Casten still in Congress?
This site shows Sean Casten holding Illinois's 6th 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 6th Congressional District
This congressional district contains 53 ZIP codes. The most common 10 are shown below; expand the full list to see every ZIP in the district.
45 of these ZIP codes also extend into another Illinois district, so a ZIP code here does not always identify a single representative. Examples include 60101 (also in the 3rd and 8th), 60126 (also in the 3rd and 4th and 7th), 60137 (also in the 3rd and 8th), 60148 (also in the 3rd and 8th), 60181 (also in the 3rd and 4th), 60187 (also in the 3rd), 60189 (also in the 3rd and 11th), 60406 (also in the 1st and 2nd).
- 60101
- 60126
- 60137
- 60148
- 60181
- 60187
- 60189
- 60406
- 60415
- 60418
View all 53 ZIP codes in this district
- 60101
- 60126
- 60137
- 60148
- 60181
- 60187
- 60189
- 60406
- 60415
- 60418
- 60439
- 60445
- 60452
- 60453
- 60455
- 60456
- 60457
- 60458
- 60459
- 60462
- 60463
- 60464
- 60465
- 60467
- 60472
- 60477
- 60480
- 60482
- 60487
- 60501
- 60514
- 60515
- 60516
- 60517
- 60521
- 60523
- 60525
- 60526
- 60527
- 60532
- 60534
- 60540
- 60558
- 60559
- 60561
- 60563
- 60620
- 60629
- 60638
- 60643
- 60655
- 60803
- 60805
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)
Local surveillance camera contracts
Automated license plate reader contracts are approved locally, by city councils and county boards, not by Congress. These places in this district have a contract record documented from public sources:
Records compiled by Who Approved This, an independent public-records project. Approval dates, amounts, and end dates are cited to council agendas, minutes, and signed contracts.
Place list rebuilt from the Who Approved This public export on September 26, 2026.
Last updated September 27, 2026.
Data last checked September 26, 2026.
See how this district compares with another using Compare Districts.