ZIP code 48821: Windsor, MI
ZIP code 48821 is in Dimondale (19% of residents), in Eaton County (95%) and Ingham County (5.0%), Michigan. 81% of its residents live outside city limits. It is in Michigan's 7th congressional district. Its state senate district is State Senate District 21; its state house districts are State House District 76 (95%) and State House District 74 (5.0%).
See it on the mapAll of Michigan
City and county
| City or town | Share of ZIP residents |
|---|---|
| Dimondale | 19% |
| County | Share of ZIP residents |
|---|---|
| Eaton County | 95% |
| Ingham County | 5.0% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Windsor charter township | 95% |
| Delhi charter township | 5.0% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Michigan's 7th congressional district (MI-07) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MI-07) | Tom Barrett (R) | 202-225-4872 | 100% |
| U.S. Senator | Elissa Slotkin (D) | 202-224-4822 | statewide |
| U.S. Senator | Gary C. Peters (D) | 202-224-6221 · contact form | statewide |
| State Senator (State Senate District 21) | Sarah Anthony (Democratic) | 100% | |
| State Representative (State House District 76) | Angela Witwer (Democratic) | 95% | |
| State Representative (State House District 74) | Kara Hope (Democratic) | 5.0% |
Elected under MI's previous legislative map; the district's lines changed for 2026.
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Dimondale laws: search for the Dimondale, Michigan code of ordinances
- Eaton County website: http://www.eatoncounty.org
- Eaton County laws: search for the Eaton County, Michigan code of ordinances
- Ingham County website: http://www.ingham.org
- Ingham County laws: search for the Ingham County, Michigan code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 21 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 76 | 95% |
| State House District 74 | 5.0% |
Voting precincts
3 voting precincts overlap ZIP 48821. 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:48821")
ZIP 48821 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.