Boundary Atlas

ZIP code 63456: Monroe City, MO

ZIP code 63456 is in Monroe City (60% of residents), in Monroe County (58%), Marion County (25%) and Ralls County (17%), Missouri. 40% of its residents live outside city limits. It is in Missouri's 6th congressional district. Its state senate district is State Senate District 18; its state house districts are State House District 43 (58%) and State House District 5 (42%).

4,432residents (2020 Census)
181.9 sq miland area
1cities and towns
1congressional district
6voting precincts

See it on the mapAll of Missouri

City and county

City or townShare of ZIP residents
Monroe City60%

CountyShare of ZIP residents
Monroe County58%
Marion County25%
Ralls County17%

Town or county subdivisionShare of ZIP residents
Monroe township55%
Warren township25%
Saline township17%
Indian Creek township2.6%
Union township0.4%
Jefferson townshipland only

Congressional district

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

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (MO-06)Sam Graves (R)202-225-7041100%
U.S. SenatorEric Schmitt (R)202-224-5721 · contact formstatewide
U.S. SenatorJosh Hawley (R)202-224-6154 · contact formstatewide
State Senator (State Senate District 18)Cindy O'Laughlin (R)100%
State Representative (State House District 43)Kent Haden (R)58%
State Representative (State House District 5)Louis Riggs (R)42%

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 18100%

State house districtShare of ZIP residents
State House District 4358%
State House District 542%

Voting precincts

6 voting precincts overlap ZIP 63456. 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:63456")

ZIP 63456 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.