Boundary Atlas

ZIP code 48604: Carrollton, MI

ZIP code 48604 is in Zilwaukee (12% of residents), in Saginaw County (99%) and Bay County (1.0%), Michigan. 88% of its residents live outside city limits. It is in Michigan's 8th congressional district. Its state senate district is State Senate District 35; its state house districts are State House District 97 (51%), State House District 94 (45%), State House District 93 (3.8%) and State House District 96 (1.0%).

12,386residents (2020 Census)
26.3 sq miland area
2cities and towns
1congressional district
9voting precincts

See it on the mapAll of Michigan

City and county

City or townShare of ZIP residents
Zilwaukee12%
Saginaw0.8%

CountyShare of ZIP residents
Saginaw County99%
Bay County1.0%

Town or county subdivisionShare of ZIP residents
Carrollton township42%
Kochville township38%
Zilwaukee city12%
Saginaw charter township5.2%
Frankenlust township1.0%
Saginaw city0.8%
Zilwaukee township0.4%

Congressional district

Congressional districtShare of ZIP residents
Michigan's 8th congressional district (MI-08)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 35100%

State house districtShare of ZIP residents
State House District 9751%
State House District 9445%
State House District 933.8%
State House District 961.0%

Voting precincts

9 voting precincts overlap ZIP 48604. 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:48604")

ZIP 48604 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.