ZIP code 49240: Grass Lake, MI
ZIP code 49240 is in Grass Lake (12% of residents), in Jackson County (91%) and Washtenaw County (9.2%), Michigan. 88% of its residents live outside city limits. It is in Michigan's 5th congressional district (91%) and Michigan's 6th congressional district (9.2%). Its state senate district is State Senate District 14; its state house districts are State House District 47 (46%), State House District 46 (37%) and State House District 48 (17%).
See it on the mapAll of Michigan
City and county
| City or town | Share of ZIP residents |
|---|---|
| Grass Lake | 12% |
| County | Share of ZIP residents |
|---|---|
| Jackson County | 91% |
| Washtenaw County | 9.2% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Grass Lake charter township | 61% |
| Waterloo township | 17% |
| Leoni township | 8.0% |
| Sharon township | 5.9% |
| Napoleon township | 3.4% |
| Sylvan township | 3.3% |
| Norvell township | 2.0% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Michigan's 5th congressional district (MI-05) | 91% |
| Michigan's 6th congressional district (MI-06) | 9.2% |
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.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MI-05) | Tim Walberg (R) | 202-225-6276 | 91% |
| U.S. Representative (MI-06) | Debbie Dingell (D) | 202-225-4071 | 9.2% |
| 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 14) | Sue Shink (Democratic) | 100% | |
| State Representative (State House District 47) | Carrie Rheingans (Democratic) | 46% | |
| State Representative (State House District 46) | Kathy Schmaltz (R) | 37% | |
| State Representative (State House District 48) | Jennifer Conlin (Democratic) | 17% |
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
- Grass Lake laws: search for the Grass Lake, Michigan code of ordinances
- Jackson County website: http://www.co.jackson.mi.us
- Jackson County laws: search for the Jackson County, Michigan code of ordinances
- Washtenaw County website: https://washtenaw.org
- Washtenaw County laws: search for the Washtenaw County, Michigan code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 14 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 47 | 46% |
| State House District 46 | 37% |
| State House District 48 | 17% |
Voting precincts
8 voting precincts overlap ZIP 49240. 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:49240")
ZIP 49240 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.