Boundary Atlas

ZIP code 82604: Casper, WY

ZIP code 82604 is in Casper (71% of residents), Mills (8.8%), Vista West (3.5%) and Red Butte (1.5%), in Natrona County, Wyoming. 15% of its residents live outside city limits. It is in Wyoming's at-large congressional district. Its state senate districts are State Senate District 29 (57%) and State Senate District 30 (43%); its state house districts are State House District 38 (35%), State House District 59 (28%), State House District 37 (28%) and State House District 58 (8.5%).

26,539residents (2020 Census)
1,048.4 sq miland area
6cities and towns
1congressional district
21voting precincts

See it on the mapAll of Wyoming

City and county

City or townShare of ZIP residents
Casper71%
Mills8.8%
Vista West3.5%
Red Butte1.5%
Bessemer Bend0.8%
Mountain View<0.1%

CountyShare of ZIP residents
Natrona County100%

Town or county subdivisionShare of ZIP residents
Casper CCD67%
Hells Half Acre CCD27%
Casper South CCD6.5%
Casper North CCDland only

Congressional district

Congressional districtShare of ZIP residents
Wyoming's at-large congressional district (WY-AL)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 2957%
State Senate District 3043%

State house districtShare of ZIP residents
State House District 3835%
State House District 5928%
State House District 3728%
State House District 588.5%

Voting precincts

21 voting precincts overlap ZIP 82604. Map them, with each precinct's share of the ZIP's residents.

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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:82604")

ZIP 82604 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.