ZIP code 80504: Longmont, CO
ZIP code 80504 is in Longmont (51% of residents), Firestone (24%) and Frederick (12%), in Boulder County (52%), Weld County (47%) and Larimer County (0.3%), Colorado. 13% of its residents live outside city limits. It is in Colorado's 2nd congressional district (56%) and Colorado's 8th congressional district (44%). Its state senate districts are State Senate District 17 (53%), State Senate District 23 (45%) and State Senate District 15 (1.8%); its state house districts are State House District 19 (66%), State House District 11 (32%), State House District 49 (1.7%), State House District 64 (0.7%) and State House District 12 (<0.1%).
See it on the mapAll of Colorado
City and county
| City or town | Share of ZIP residents |
|---|---|
| Longmont | 51% |
| Firestone | 24% |
| Frederick | 12% |
| Mead | 0.3% |
| County | Share of ZIP residents |
|---|---|
| Boulder County | 52% |
| Weld County | 47% |
| Larimer County | 0.3% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Longmont CCD | 52% |
| Erie-Frederick CCD | 39% |
| Johnstown-Milliken CCD | 8.5% |
| Berthoud CCD | 0.3% |
| Lafayette-Louisville CCD | 0.1% |
| Platteville CCD | <0.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Colorado's 2nd congressional district (CO-02) | 56% |
| Colorado's 8th congressional district (CO-08) | 44% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Susie Hidalgo-Fahring | 303-651-8601 | 51% |
| U.S. Representative (CO-02) | Joe Neguse (D) | 202-225-2161 | 56% |
| U.S. Representative (CO-08) | Gabe Evans (R) | 202-225-5625 | 44% |
| 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 17) | Katie Wallace (Democratic) | 53% | |
| State Senator (State Senate District 23) | Barbara Kirkmeyer (R) | 45% | |
| State Senator (State Senate District 15) | Janice Marchman (Democratic) | 1.8% | |
| State Representative (State House District 19) | Dan Woog (R) | 66% | |
| State Representative (State House District 11) | Karen McCormick (Democratic) | 32% | |
| State Representative (State House District 49) | Lesley Smith (Democratic) | 1.7% | |
| State Representative (State House District 64) | Scott Slaugh (R) | 0.7% | |
| State Representative (State House District 12) | Kyle Brown (Democratic) | <0.1% |
Officials serving now (members of Congress until January 3, 2027). Sources: Mayors: Open States (public domain); State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Longmont laws: search for the Longmont, Colorado code of ordinances
- Firestone website: http://www.FirestoneCO.gov
- Firestone laws: search for the Firestone, Colorado code of ordinances
- Frederick website: http://www.frederickco.gov
- Frederick laws: search for the Frederick, Colorado code of ordinances
- Boulder County website: http://www.bouldercounty.org
- Boulder County laws: search for the Boulder County, Colorado code of ordinances
- Weld County laws: search for the Weld County, Colorado code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 17 | 53% |
| State Senate District 23 | 45% |
| State Senate District 15 | 1.8% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 19 | 66% |
| State House District 11 | 32% |
| State House District 49 | 1.7% |
| State House District 64 | 0.7% |
| State House District 12 | <0.1% |
Voting precincts
45 voting precincts overlap ZIP 80504. 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://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:80504")
ZIP 80504 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.