Boundary Atlas

ZIP code 49042: Constantine, MI

ZIP code 49042 is in Constantine (42% of residents), in St. Joseph County (99%) and Cass County (1.3%), Michigan. 58% of its residents live outside city limits. It is in Michigan's 5th congressional district. Its state senate district is State Senate District 17; its state house district is State House District 36.

4,641residents (2020 Census)
57.1 sq miland area
1cities and towns
1congressional district
5voting precincts

See it on the mapAll of Michigan

City and county

City or townShare of ZIP residents
Constantine42%

CountyShare of ZIP residents
St. Joseph County99%
Cass County1.3%

Town or county subdivisionShare of ZIP residents
Constantine township83%
Florence township16%
Porter township1.3%
Lockport township0.6%

Congressional district

Congressional districtShare of ZIP residents
Michigan's 5th congressional district (MI-05)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 17100%

State house districtShare of ZIP residents
State House District 36100%

Voting precincts

5 voting precincts overlap ZIP 49042. 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:49042")

ZIP 49042 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.