ZIP code 49230: Columbia, MI
ZIP code 49230 is in Brooklyn (13% of residents) and Vineyard Lake (9.6%), in Jackson County (79%) and Lenawee County (21%), Michigan. 78% of its residents live outside city limits. It is in Michigan's 5th congressional district. Its state senate districts are State Senate District 14 (79%) and State Senate District 16 (21%); its state house districts are State House District 47 (79%) and State House District 34 (21%).
See it on the mapAll of Michigan
City and county
| City or town | Share of ZIP residents |
|---|---|
| Brooklyn | 13% |
| Vineyard Lake | 9.6% |
| County | Share of ZIP residents |
|---|---|
| Jackson County | 79% |
| Lenawee County | 21% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Columbia township | 54% |
| Norvell township | 24% |
| Cambridge township | 15% |
| Woodstock township | 5.9% |
| Napoleon township | 0.5% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Michigan's 5th congressional district (MI-05) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MI-05) | Tim Walberg (R) | 202-225-6276 | 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 14) | Sue Shink (Democratic) | 79% | |
| State Senator (State Senate District 16) | Joe Bellino (R) | 21% | |
| State Representative (State House District 47) | Carrie Rheingans (Democratic) | 79% | |
| State Representative (State House District 34) | Nancy Jenkins-Arno (R) | 21% |
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
- Brooklyn website: http://www.villageofbrooklyn.com/
- Brooklyn laws: search for the Brooklyn, Michigan code of ordinances
- Vineyard Lake laws: search for the Vineyard 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
- Lenawee County website: https://www.lenawee.mi.us/
- Lenawee County laws: search for the Lenawee County, Michigan code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 14 | 79% |
| State Senate District 16 | 21% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 47 | 79% |
| State House District 34 | 21% |
Voting precincts
9 voting precincts overlap ZIP 49230. 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:49230")
ZIP 49230 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.