Boundary Atlas

ZIP code 64490: Stewartsville, MO

ZIP code 64490 is in Stewartsville (36% of residents), in DeKalb County (68%), Clinton County (32%) and Buchanan County (0.2%), Missouri. 64% of its residents live outside city limits. It is in Missouri's 6th congressional district. Its state senate district is State Senate District 12; its state house districts are State House District 9 (100%) and State House District 13 (0.2%).

2,052residents (2020 Census)
87.1 sq miland area
1cities and towns
1congressional district
7voting precincts

See it on the mapAll of Missouri

City and county

City or townShare of ZIP residents
Stewartsville36%

CountyShare of ZIP residents
DeKalb County68%
Clinton County32%
Buchanan County0.2%

Town or county subdivisionShare of ZIP residents
Washington township64%
Lafayette township29%
Colfax township2.9%
Platte township2.7%
Sherman township1.4%
Tremont township0.2%

Congressional district

Congressional districtShare of ZIP residents
Missouri's 6th congressional district (MO-06)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 12100%

State house districtShare of ZIP residents
State House District 9100%
State House District 130.2%

Voting precincts

7 voting precincts overlap ZIP 64490. 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:64490")

ZIP 64490 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.