Boundary Atlas

ZIP code 65321: Blackburn, MO

ZIP code 65321 is in Blackburn (53% of residents), in Saline County (92%) and Lafayette County (8.3%), Missouri. 47% of its residents live outside city limits. It is in Missouri's 4th congressional district. Its state senate district is State Senate District 21; its state house district is State House District 51.

399residents (2020 Census)
38.6 sq miland area
1cities and towns
1congressional district
3voting precincts

See it on the mapAll of Missouri

City and county

City or townShare of ZIP residents
Blackburn53%

CountyShare of ZIP residents
Saline County92%
Lafayette County8.3%

Town or county subdivisionShare of ZIP residents
Elmwood township91%
Davis township8.3%
Grand Pass township0.8%

Congressional district

Congressional districtShare of ZIP residents
Missouri's 4th congressional district (MO-04)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 21100%

State house districtShare of ZIP residents
State House District 51100%

Voting precincts

3 voting precincts overlap ZIP 65321. 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:65321")

ZIP 65321 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.