Boundary Atlas

Johnstown, Colorado

Johnstown is a town in Weld County (73% of residents) and Larimer County (27%), Colorado, with 17,399 residents in 2020. It is in Colorado's 8th congressional district. It spans 2 state house districts. Its state senate district is State Senate District 23.

17,399residents (2020 Census)
15.6 sq miland area
1ZIP codes
1congressional district

County

CountyShare of residents
Weld County73%
Larimer County27%

Congressional district

Congressional districtShare of residents
Colorado's 8th congressional district (CO-08)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (CO-08)Gabe Evans (R)202-225-5625100%
U.S. SenatorJohn W. Hickenlooper (D)202-224-5941 · contact formstatewide
U.S. SenatorMichael F. Bennet (D)202-224-5852 · contact formstatewide
State Senator (State Senate District 23)Barbara Kirkmeyer (R)100%
State Representative (State House District 64)Scott Slaugh (R)73%
State Representative (State House District 65)Lori Garcia Sander (R)27%

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).

Local government

State legislative districts

State senate districtShare of residents
State Senate District 23100%

State house districtShare of residents
State House District 6473%
State House District 6527%

ZIP codes

Percentages mark ZIPs only partly in Johnstown: the share of that ZIP's residents living in it.

Get this in your AI agent

Your agent can get Johnstown'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:0839855")

Johnstown 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.