ZIP code 80229: Thornton, CO
ZIP code 80229 is in Thornton (68% of residents) and Welby (29%), in Adams County, Colorado. It is in Colorado's 8th congressional district. Its state senate districts are State Senate District 24 (71%) and State Senate District 21 (29%); its state house districts are State House District 31 (71%) and State House District 32 (29%).
See it on the mapAll of Colorado
City and county
| City or town | Share of ZIP residents |
|---|---|
| Thornton | 68% |
| Welby | 29% |
| North Washington | 0.5% |
| County | Share of ZIP residents |
|---|---|
| Adams County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| West Adams CCD | 100% |
| Commerce City CCD | 0.5% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Colorado's 8th congressional district (CO-08) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Janifer Kulmann | 68% | |
| U.S. Representative (CO-08) | Gabe Evans (R) | 202-225-5625 | 100% |
| U.S. Senator | John W. Hickenlooper (D) | 202-224-5941 · contact form | statewide |
| U.S. Senator | Michael F. Bennet (D) | 202-224-5852 · contact form | statewide |
| State Senator (State Senate District 24) | Kyle Mullica (Democratic) | 71% | |
| State Senator (State Senate District 21) | Adrienne Benavidez (Democratic) | 29% | |
| State Representative (State House District 31) | Jacque Phillips (Democratic) | 71% | |
| State Representative (State House District 32) | María González (Democratic) | 29% |
From Wikidata (community-maintained); confirm on the city's website.
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0); Mayors: Wikidata (CC0).
Local government
- Thornton website: http://www.cityofthornton.net/
- Thornton laws: search for the Thornton, Colorado code of ordinances
- Welby laws: search for the Welby, Colorado code of ordinances
- Adams County laws: search for the Adams County, Colorado code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 24 | 71% |
| State Senate District 21 | 29% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 31 | 71% |
| State House District 32 | 29% |
Voting precincts
23 voting precincts overlap ZIP 80229. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:80229")
ZIP 80229 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.