Boundary Atlas

ZIP code 48858: Mount Pleasant, MI

ZIP code 48858 is in Mount Pleasant (46% of residents), in Isabella County (99%) and Midland County (0.5%), Michigan. 54% of its residents live outside city limits. It is in Michigan's 2nd congressional district. Its state senate district is State Senate District 34; its state house districts are State House District 92 (99%) and State House District 95 (0.5%).

41,844residents (2020 Census)
174.4 sq miland area
2cities and towns
1congressional district
16voting precincts

See it on the mapAll of Michigan

City and county

City or townShare of ZIP residents
Mount Pleasant46%
Beal City0.3%

CountyShare of ZIP residents
Isabella County99%
Midland County0.5%

Town or county subdivisionShare of ZIP residents
Mount Pleasant city46%
Union charter township28%
Chippewa township9.1%
Deerfield township7.4%
Denver township2.1%
Isabella township2.1%
Lincoln township1.5%
Fremont township1.2%
Nottawa township1.2%
Broomfield township0.9%
Greendale township0.5%

Congressional district

Congressional districtShare of ZIP residents
Michigan's 2nd congressional district (MI-02)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 34100%

State house districtShare of ZIP residents
State House District 9299%
State House District 950.5%

Voting precincts

16 voting precincts overlap ZIP 48858. 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:48858")

ZIP 48858 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.