Boundary Atlas

ZIP code 45865: Minster, OH

ZIP code 45865 is in Minster (58% of residents), in Auglaize County (76%), Shelby County (24%) and Mercer County (0.7%), Ohio. 42% of its residents live outside city limits. It is in Ohio's 4th congressional district. Its state senate district is State Senate District 12; its state house districts are State House District 84 (76%) and State House District 85 (24%).

5,251residents (2020 Census)
35.4 sq miland area
3cities and towns
1congressional district
8voting precincts

See it on the mapAll of Ohio

City and county

City or townShare of ZIP residents
Minster58%
Maria Stein0.7%
New Bremen0.2%

CountyShare of ZIP residents
Auglaize County76%
Shelby County24%
Mercer County0.7%

Town or county subdivisionShare of ZIP residents
Jackson township74%
McLean township21%
Van Buren township2.7%
German township1.1%
Marion township0.7%

Congressional district

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 12100%

State house districtShare of ZIP residents
State House District 8476%
State House District 8524%

Voting precincts

8 voting precincts overlap ZIP 45865. 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:45865")

ZIP 45865 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.