ZIP code 48890: Sunfield, MI
ZIP code 48890 is in Sunfield (25% of residents), in Eaton County (64%) and Ionia County (36%), Michigan. 75% of its residents live outside city limits. It is in Michigan's 2nd congressional district (94%) and Michigan's 7th congressional district (5.9%). Its state senate districts are State Senate District 21 (64%) and State Senate District 33 (36%); its state house district is State House District 78.
See it on the mapAll of Michigan
City and county
| City or town | Share of ZIP residents |
|---|---|
| Sunfield | 25% |
| County | Share of ZIP residents |
|---|---|
| Eaton County | 64% |
| Ionia County | 36% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Sunfield township | 58% |
| Danby township | 20% |
| Sebewa township | 16% |
| Roxand township | 5.9% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Michigan's 2nd congressional district (MI-02) | 94% |
| Michigan's 7th congressional district (MI-07) | 5.9% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 21 | 64% |
| State Senate District 33 | 36% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 78 | 100% |
Voting precincts
4 voting precincts overlap ZIP 48890. 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:48890")
ZIP 48890 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.