Colorado’s 1st Congressional District is represented by Diana DeGette (D) in the U.S. House of Representatives. The district is one of Colorado’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
719,744
Median Household Income
$91,539
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+56
2024 presidential margin (Trump vs Harris). Source: The Downballot.
District boundary, 119th Congress. Boundary data: U.S. Census Bureau TIGERweb. Map tiles: OpenStreetMap.
Diana DeGette and Colorado's 1st Congressional District
Diana DeGette, a member of the Democratic Party, represents Colorado's 1st Congressional District and has held the seat since January 7, 1997. 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 Energy and Commerce.
The current term ends January 3, 2027. The seat is on the ballot on Tuesday, November 3, 2026. Washington office phone: 202-225-4431. Official site: degette.house.gov.
Current Representative
Rep. Diana DeGette (D)
119th Congress • Democrat • Representing this district since January 7, 1997
Diana DeGette currently represents Colorado’s 1st 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
- Melat Kiros, Democratic
- Christy Peterson, Republican
- Critter Milton, Unity
- Chad Humphrey, Libertarian
- Shimon Blau, Unaffiliated
Source: Colorado Secretary of State, 2026 general election candidate list, checked September 26, 2026. Write-in candidates are not listed.
Key dates for November 3, 2026
| Register by mail | Monday, October 26 Application must be received by this date. |
|---|---|
| Register online | Monday, October 26 |
| Register in person | Through Election Day, November 3 |
| Same-day registration | Register by October 26 to be mailed a ballot. After that, register and vote in person at a voter service and polling center through Election Day. |
| Early in-person voting | October 19 to November 2 Voter service and polling centers open by October 19 and stay open on Election Day. |
| Mail ballot | Every active voter is mailed a ballot. No request is needed. |
| Return a mail ballot | Must be received by 7 p.m. on November 3. Postmarks do not count. |
| Election Day | Tuesday, November 3, 2026 |
Check your registration with the Colorado voter lookup. Dates come from the Colorado election office and were checked September 26, 2026. States can change deadlines, so confirm with your election office before you act.
Polling places in Colorado are open 7 a.m. to 7 p.m., local time. Confirm your registration and polling place on the official federal voter page for Colorado: vote.gov.
What is on the ballot nationally on November 3, 2026
Contact Your Representative
Washington Office
2111 Rayburn House Office Building
Washington, DC 20515
Phone: (202) 225-4431
Online
Committee Assignments
About This District
The district lies within Denver County in Colorado. Its largest cities are Denver (about 716,000) and Glendale (about 5,000).
This page covers Colorado District 1, 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 Colorado's 1st Congressional District?
Diana DeGette (D) represents Colorado's 1st Congressional District in the U.S. House of Representatives.
What political party is Diana DeGette a member of?
Diana DeGette is a member of the Democratic Party.
How can I contact Diana DeGette?
You can reach Diana DeGette by phone at 202-225-4431 or through their official website at https://degette.house.gov.
When does Diana DeGette's current term end?
Diana DeGette's current term in the U.S. House of Representatives ends on January 3, 2027.
Where is Colorado's 1st Congressional District?
Colorado's 1st Congressional District is located in the state of Colorado and is one of the 435 voting congressional districts in the U.S. House of Representatives.
What district does Diana DeGette represent?
Diana DeGette has represented Colorado's 1st Congressional District since January 7, 1997. The boundary map for the district is on this page.
Where can I see a map of Diana DeGette's district?
The boundary map for Colorado's 1st Congressional District is on this page. It is drawn from U.S. Census Bureau TIGERweb boundary files for the 119th Congress.
What committees is Diana DeGette on?
Diana DeGette sits on House Committee on Energy and Commerce. Committee assignments come from the Clerk of the House MemberData file.
Is Diana DeGette still in Congress?
This site shows Diana DeGette holding Colorado's 1st 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 Colorado
ZIP Codes in Colorado's 1st Congressional District
This congressional district contains 43 ZIP codes. The most common 10 are shown below; expand the full list to see every ZIP in the district.
23 of these ZIP codes also extend into another Colorado district, so a ZIP code here does not always identify a single representative. Examples include 80012 (also in the 6th), 80014 (also in the 6th), 80110 (also in the 6th), 80111 (also in the 6th), 80112 (also in the 4th and 6th), 80123 (also in the 6th and 7th), 80212 (also in the 7th and 8th), 80214 (also in the 7th).
- 80012
- 80014
- 80110
- 80111
- 80112
- 80123
- 80202
- 80203
- 80204
- 80205
View all 43 ZIP codes in this district
- 80012
- 80014
- 80110
- 80111
- 80112
- 80123
- 80202
- 80203
- 80204
- 80205
- 80206
- 80207
- 80209
- 80210
- 80211
- 80212
- 80214
- 80216
- 80218
- 80219
- 80220
- 80221
- 80222
- 80223
- 80224
- 80226
- 80227
- 80230
- 80231
- 80232
- 80235
- 80236
- 80237
- 80238
- 80239
- 80246
- 80247
- 80249
- 80264
- 80266
- 80290
- 80293
- 80294
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: Michael F. Bennet (D), John W. Hickenlooper (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.