14 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 48197 | Ypsilanti | 66,525 |
| 48103 | Ann Arbor | 55,054 |
| 48104 | Ann Arbor | 43,979 |
| 48198 | Ypsilanti | 39,244 |
| 48105 | Ann Arbor | 37,048 |
| 48108 | Ann Arbor | 27,666 |
| 48176 | Saline | 23,451 |
| 48130 | Dexter | 16,986 |
| 48189 | Whitmore Lake | 13,893 |
| 48118 | Chelsea | 13,246 |
| 48158 | Manchester | 7,770 |
| 48109 | Ann Arbor | 5,939 |
| 48191 | Willis | 4,403 |
| 48190 | Whittaker | 76 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 14 ZCTAs in Washtenaw County, Michigan (US Census).