County ZIP codes · Michigan · FIPS 26161
Washtenaw County, MI ZIP Codes
Washtenaw County, Michigan has 32 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 27 residential and 5 for PO boxes or a single organization. 14 of the residential ones lie mainly in Washtenaw County and 13 mainly in a neighboring county; 16 cross the county line. Median household income ranges from $63,326 in 48198 (Ypsilanti) to $187,589 in 48168 (Northville) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Washtenaw County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $78,973 and $114,206.
They carry 21 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 27 residential ZIP codes in Washtenaw County
14 ZIP codes lie mainly in Washtenaw County; 13 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 48197 | Ypsilanti | 66,525 | 1,613 | $74k | $295k | 100% |
| 48103 | Ann Arbor | 55,054 | 828 | $116k | $472k | 100% |
| 48104 | Ann Arbor | 43,979 | 5,642 | $64k | $491k | 100% |
| 48198 | Ypsilanti | 39,244 | 1,177 | $63k | $189k | 100% |
| 48105 | Ann Arbor | 37,048 | 748 | $95k | $503k | 100% |
| 48108 | Ann Arbor | 27,666 | 1,649 | $89k | $407k | 100% |
| 48176 | Saline | 23,451 | 331 | $114k | $408k | 100% |
| 48130 | Dexter | 16,986 | 265 | $129k | $481k | 100% |
| 48189 | Whitmore Lake | 13,893 | 406 | $87k | $313k | 70% |
| 48118 | Chelsea | 13,246 | 154 | $88k | $357k | 100% |
| 48158 | Manchester | 7,770 | 82 | $95k | $312k | 99% |
| 48109 | Ann Arbor | 5,939 | 4,257 | $14k | – | 100% |
| 48191 | Willis | 4,403 | 273 | $103k | $272k | 88% |
| 48190 | Whittaker | 76 | 91 | $77k | $219k | 100% |
Partly in Washtenaw County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 48160 | Milan | 13,972 | 179 | $104k | $265k | 48% |
| 48168 | Northville | 25,038 | 1,278 | $188k | $583k | 45% |
| 48170 | Plymouth | 40,076 | 1,162 | $114k | $418k | 45% |
| 49236 | Clinton | 5,026 | 134 | $80k | $230k | 45% |
| 48178 | South Lyon | 37,789 | 788 | $132k | $411k | 34% |
| 48137 | Gregory | 4,157 | 96 | $79k | $307k | 25% |
| 48167 | Northville | 24,713 | 1,272 | $125k | $453k | 24% |
| 49240 | Grass Lake | 8,863 | 85 | $100k | $299k | 15% |
| 49287 | Tipton | 1,958 | 70 | $88k | $263k | 5% |
| 48169 | Pinckney | 20,519 | 356 | $109k | $373k | 5% |
| 49285 | Stockbridge | 6,240 | 82 | $73k | $210k | 3% |
| 48111 | Belleville | 44,709 | 668 | $77k | $262k | 2% |
| 49229 | Britton | 3,540 | 63 | $95k | $227k | 1% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
16 ZIP codes of Washtenaw County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Washtenaw | Elsewhere |
|---|---|---|
| 48111 | 2% | Wayne County 97% |
| 48170 | 45% | Wayne County 55% |
| 48178 | 34% | Oakland County 36%; Livingston County 29% |
| 48168 | 45% | Wayne County 55% |
| 48167 | 24% | Oakland County 46%; Wayne County 30% |
| 48169 | 5% | Livingston County 95% |
| 48160 | 48% | Monroe County 52% |
| 48189 | 70% | Livingston County 30% |
| 49240 | 15% | Jackson County 85% |
| 48158 | 99% | Jackson County 1% |
| 49285 | 3% | Ingham County 80%; Jackson County 10%; Livingston County 6% |
| 49236 | 45% | Lenawee County 55% |
| 48191 | 88% | Monroe County 12% |
| 48137 | 25% | Livingston County 75% |
| 49229 | 1% | Lenawee County 88%; Monroe County 11% |
| 49287 | 5% | Lenawee County 95% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Washtenaw County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Washtenaw County's ZIP codes use 2 prefixes: 481 and 492.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.