Michigan ZIP codes
Michigan holds 1,159 ZIP codes between 48001 and 49971. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Michigan
| Place | ZIP codes |
|---|---|
| Detroit | 46 |
| Grand Rapids | 26 |
| Lansing | 22 |
| Flint | 17 |
| Saginaw | 11 |
| Kalamazoo | 10 |
| Ann Arbor | 8 |
| Warren | 7 |
| Midland | 7 |
| Battle Creek | 6 |
| Muskegon | 6 |
| Troy | 6 |
| Southfield | 6 |
| Farmington | 6 |
| Dearborn | 6 |
| Sterling Heights | 5 |
| Livonia | 5 |
| Kincheloe | 4 |
| Traverse City | 4 |
| East Lansing | 4 |
Michigan counties by ZIP count
| County | ZIP codes |
|---|---|
| Wayne | 94 |
| Oakland | 87 |
| Kent | 46 |
| Macomb | 41 |
| Genesee | 36 |
| Ingham | 35 |
| Berrien | 25 |
| Kalamazoo | 24 |
| Saginaw | 23 |
| St. Clair | 23 |
Reading a Michigan ZIP code
Michigan holds 1,159 ZIP codes between 48001 and 49971, spread over 83 counties. Detroit leads the state with 46 codes, ahead of Grand Rapids with 26. Every code here opens with the digit 4: that opening number is the national postal region Michigan belongs to, the next two digits name the sectional center that sorts the mail, and the final two point to the local office. A ZIP+4 suffix narrows delivery to a block face. Boundaries follow carrier routes rather than city limits, which is why Detroit spreads across 46 codes while some rural codes cross county lines.
Source: GeoNames postal dataset (CC BY 4.0), snapshot of 2026-07-09. Counts cover standard delivery ZIPs listed for Michigan; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources