| ZIP Codes: | 19 ZIP Codes (13 Standard, 6 PO Box, 0 Unique) [See All] |
| Area Code: | 734 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 11:53:53 PM |
| Population: | 355,280 [See All] |
| FIPS: | 26161 |
| CBSA: | Ann Arbor, MI |
| Land Area: | 601 sq mi |
| Water Area: | 13 sq mi |
| Coordinates: | 42.2567, -83.7577 |
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355,280 residents live across 19 ZIPs covering 601 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 337,855 to 355,280 from 2014 to 2024 — a +5.2% change. 11 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 48130 (Dexter, $129,254 median) and poorest ZIP 48109 (Ann Arbor, $14,093) are 9.9 miles apart — a 9.2× income gap across local geography.
Median home values vary 2.7× across this county — from $189,100 in 48198 (Ypsilanti) to $503,100 in 48105 (Ann Arbor).
Density varies 294× across the county — from 82 people/sq mi in 48158 (Manchester) to 24,006 in 48109 (Ann Arbor).
Educational attainment ranges from 24.4% bachelor's+ in 48191 (Willis) to 82.7% in 48105 (Ann Arbor) — the breadth of educational profiles across the area.
Within Michigan, this is the #6 most populous of 83 counties and ranks #6 for median household income with the #13 fastest decade growth .
Weighted by population, the typical household earns about $87,616 across the county — reflecting what a typical resident sees, not a simple ZIP average.
59.9% of adults age 25+ hold a bachelor's degree or higher (135,904 of 226,812 reporting). The most-educated ZIPs cluster around Ann Arbor.
13 Standard delivery, 6 PO Box only, 0 single-entity Unique ZIPs serve this county.
7 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Median household income spans 9.2× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 48197 | Ypsilanti | Standard | 66,525 | $73,737 | 42.3 | 5.0% |
| 48103 | Ann Arbor | Standard | 55,054 | $116,194 | 66.9 | 0.5% |
| 48104 | Ann Arbor | Standard | 43,979 | $64,231 | 8.5 | 11.7% |
| 48198 | Ypsilanti | Standard | 39,244 | $63,326 | 34.1 | 3.6% |
| 48105 | Ann Arbor | Standard | 37,048 | $94,774 | 52.3 | 8.4% |
| 48108 | Ann Arbor | Standard | 27,666 | $89,355 | 16.7 | 4.8% |
| 48176 | Saline | Standard | 23,451 | $114,206 | 77.3 | 9.4% |
| 48130 | Dexter | Standard | 16,986 | $129,254 | 65.4 | 11.7% |
| 48189 | Whitmore Lake | Standard | 13,893 | $87,145 | 35.5 | -0.6% |
| 48118 | Chelsea | Standard | 13,246 | $88,278 | 89.9 | 3.8% |
| 48158 | Manchester | Standard | 7,770 | $94,784 | 95.2 | -0.3% |
| 48109 | Ann Arbor | Standard | 5,939 | $14,093 | 0.2 | -10.3% |
| 48191 | Willis | Standard | 4,403 | $102,833 | 15.4 | 9.7% |
| 48190 | Whittaker | PO Box | 76 | $76,875 | 1.1 | 22.6% |
| 48115 | Bridgewater | PO Box | — | — | 0.0 | — |
| 48106 | Ann Arbor | PO Box | — | — | 0.0 | — |
| 48113 | Ann Arbor | PO Box | — | — | 0.0 | — |
| 48107 | Ann Arbor | PO Box | — | — | 0.0 | — |
| 48175 | Salem | PO Box | — | — | 0.0 | — |