Boundary Atlas

ZIP code 80543: Milliken, CO

ZIP code 80543 is in Milliken (96% of residents), in Weld County, Colorado. It is in Colorado's 8th congressional district. Its state senate districts are State Senate District 23 (100%), State Senate District 1 (0.1%) and State Senate District 13 (<0.1%); its state house districts are State House District 64 (100%) and State House District 50 (<0.1%).

8,696residents (2020 Census)
30.9 sq miland area
2cities and towns
1congressional district
8voting precincts

See it on the mapAll of Colorado

City and county

City or townShare of ZIP residents
Milliken96%
Greeley0.1%

CountyShare of ZIP residents
Weld County100%

Town or county subdivisionShare of ZIP residents
Johnstown-Milliken CCD100%
Greeley CCD<0.1%

Congressional district

Congressional districtShare of ZIP 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 Senator (State Senate District 1)Byron Pelton (R)0.1%
State Senator (State Senate District 13)Scott Bright (R)<0.1%
State Representative (State House District 64)Scott Slaugh (R)100%
State Representative (State House District 50)Ryan Gonzalez (R)<0.1%

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 ZIP residents
State Senate District 23100%
State Senate District 10.1%
State Senate District 13<0.1%

State house districtShare of ZIP residents
State House District 64100%
State House District 50<0.1%

Voting precincts

8 voting precincts overlap ZIP 80543. 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:80543")

ZIP 80543 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.