ZIP code 48178: South Lyon, MI
ZIP code 48178 is in South Lyon (32% of residents) and Whitmore Lake (2.4%), in Oakland County (65%), Livingston County (29%) and Washtenaw County (6.2%), Michigan. 66% of its residents live outside city limits. It is in Michigan's 7th congressional district (94%) and Michigan's 6th congressional district (6.2%). Its state senate districts are State Senate District 13 (65%), State Senate District 22 (29%) and State Senate District 14 (6.2%); its state house districts are State House District 23 (40%), State House District 49 (33%), State House District 21 (24%) and State House District 48 (2.7%).
See it on the mapAll of Michigan
City and county
| City or town | Share of ZIP residents |
|---|---|
| South Lyon | 32% |
| Whitmore Lake | 2.4% |
| County | Share of ZIP residents |
|---|---|
| Oakland County | 65% |
| Livingston County | 29% |
| Washtenaw County | 6.2% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Lyon charter township | 33% |
| South Lyon city | 32% |
| Green Oak township | 29% |
| Salem township | 3.5% |
| Northfield township | 2.7% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Michigan's 7th congressional district (MI-07) | 94% |
| Michigan's 6th congressional district (MI-06) | 6.2% |
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-07) | Tom Barrett (R) | 202-225-4872 | 94% |
| U.S. Representative (MI-06) | Debbie Dingell (D) | 202-225-4071 | 6.2% |
| 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 13) | Rosemary Bayer (Democratic) | 65% | |
| State Senator (State Senate District 22) | Lana Theis (R) | 29% | |
| State Senator (State Senate District 14) | Sue Shink (Democratic) | 6.2% | |
| State Representative (State House District 23) | Jason Morgan (Democratic) | 40% | |
| State Representative (State House District 49) | Ann Bollin (R) | 33% | |
| State Representative (State House District 21) | Kelly Breen (Democratic) | 24% | |
| State Representative (State House District 48) | Jennifer Conlin (Democratic) | 2.7% |
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
- South Lyon website: http://www.southlyonmi.org/
- South Lyon laws: search for the South Lyon, Michigan code of ordinances
- Whitmore Lake laws: search for the Whitmore Lake, Michigan code of ordinances
- Oakland County website: http://www.oakgov.com
- Oakland County laws: search for the Oakland County, Michigan code of ordinances
- Livingston County laws: search for the Livingston County, Michigan code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 13 | 65% |
| State Senate District 22 | 29% |
| State Senate District 14 | 6.2% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 23 | 40% |
| State House District 49 | 33% |
| State House District 21 | 24% |
| State House District 48 | 2.7% |
Voting precincts
22 voting precincts overlap ZIP 48178. 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://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:48178")
ZIP 48178 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.