Boulder, Colorado
Boulder is a city in Boulder County, Colorado, with 108,448 residents in 2020. It is in Colorado's 2nd congressional district. It spans 3 state house districts. Its state senate district is State Senate District 18.
County
| County | Share of residents |
|---|---|
| Boulder County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Colorado's 2nd congressional district (CO-02) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Aaron Brockett | citywide | |
| 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) | 100% | |
| State Representative (State House District 10) | Junie Joseph (Democratic) | 81% | |
| State Representative (State House District 49) | Lesley Smith (Democratic) | 19% | |
| State Representative (State House District 12) | Kyle Brown (Democratic) | 0.1% |
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 residents |
|---|---|
| State Senate District 18 | 100% |
| State house district | Share of residents |
|---|---|
| State House District 10 | 81% |
| State House District 49 | 19% |
| State House District 12 | 0.1% |
ZIP codes
Percentages mark ZIPs only partly in Boulder: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Boulder's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:0807850")
Boulder here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.