Colorado's 1st congressional district (CO-01)
Colorado's 1st congressional district (CO-01) covers parts or all of Denver County and Arapahoe County, and 41 ZIP codes (23 wholly inside it). Its 2020 population was 721,714. This is the map in force for the November 3, 2026 election.
721,714residents (2020 Census)
2counties
41ZIP codes
307voting precincts
Who represents CO-01
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (CO-01) | Diana DeGette (D) | 202-225-4431 |
| U.S. Senator | John W. Hickenlooper (D) | 202-224-5941 · contact form |
| U.S. Senator | Michael F. Bennet (D) | 202-224-5852 · contact form |
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in CO-01 |
|---|---|
| Denver County | 100% |
| Arapahoe County | 1.1% |
ZIP codes
Percentages mark ZIPs only partly in CO-01: the share of that ZIP's residents inside it.
- 80012 (0.6%)
- 80014 (11%)
- 80110 (6.3%)
- 80123 (27%)
- 80202
- 80203
- 80204
- 80205
- 80206
- 80207
- 80209
- 80210
- 80211
- 80212 (81%)
- 80214 (1.6%)
- 80216 (97%)
- 80218
- 80219
- 80220 (99%)
- 80221 (14%)
- 80222
- 80223
- 80224 (97%)
- 80226 (1.0%)
- 80227 (27%)
- 80230 (100%)
- 80231 (57%)
- 80232 (0.5%)
- 80235 (41%)
- 80236 (92%)
- 80237
- 80238
- 80239
- 80246
- 80247 (46%)
- 80249
- 80264
- 80266
- 80290
- 80293
- 80294
Towns
Denver CCD and South Aurora CCD.
Get this in your AI agent
Your agent can draw every precinct in CO-01, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:0801", children_level="precinct", include_districts=True)