ZIP code 80305: Boulder, CO
ZIP code 80305 is in Boulder (98% of residents), in Boulder County, Colorado. It is in Colorado's 2nd congressional district. Its state senate districts are State Senate District 18 (98%) and State Senate District 15 (1.9%); its state house districts are State House District 49 (58%) and State House District 10 (42%).
See it on the mapAll of Colorado
City and county
| City or town | Share of ZIP residents |
|---|---|
| Boulder | 98% |
| Eldorado Springs | 0.6% |
| County | Share of ZIP residents |
|---|---|
| Boulder County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Boulder CCD | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Colorado's 2nd congressional district (CO-02) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Aaron Brockett | 98% | |
| U.S. Representative (CO-02) | Joe Neguse (D) | 202-225-2161 | 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 18) | Judy Amabile (Democratic) | 98% | |
| State Senator (State Senate District 15) | Janice Marchman (Democratic) | 1.9% | |
| State Representative (State House District 49) | Lesley Smith (Democratic) | 58% | |
| State Representative (State House District 10) | Junie Joseph (Democratic) | 42% |
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
- Boulder website: https://bouldercolorado.gov/
- Boulder laws: search for the Boulder, Colorado code of ordinances
- Boulder County website: http://www.bouldercounty.org
- Boulder County laws: search for the Boulder County, Colorado code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 18 | 98% |
| State Senate District 15 | 1.9% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 49 | 58% |
| State House District 10 | 42% |
Voting precincts
15 voting precincts overlap ZIP 80305. 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:80305")
ZIP 80305 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.