| ZIP Codes: | 18 ZIP Codes (16 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Code: | 734 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:33 PM |
| Population: | 162,831 [See All] |
| FIPS: | 26115 |
| CBSA: | Monroe, MI |
| Land Area: | 580 sq mi |
| Water Area: | 18 sq mi |
| Coordinates: | 41.9091, -83.5333 |
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162,831 residents live across 18 ZIPs covering 580 sq mi, served by 17 distinct USPS-recognized cities.
Population moved from 158,120 to 162,831 from 2014 to 2024 — a +3.0% change. 10 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 48140 (Ida, $109,257 median) and poorest ZIP 48157 (Luna Pier, $61,641) are 9.0 miles apart — a 1.8× income gap across local geography.
Median home values vary 1.7× across this county — from $176,200 in 48161 (Monroe) to $298,100 in 48117 (Carleton).
Density varies 17× across the county — from 80 people/sq mi in 48159 (Maybee) to 1,334 in 48144 (Lambertville).
Educational attainment ranges from 15.5% bachelor's+ in 48117 (Carleton) to 34.6% in 48131 (Dundee) — the breadth of educational profiles across the area.
Within Michigan, this is the #13 most populous of 83 counties and ranks #11 for median household income .
Weighted by population, the typical household earns about $80,285 across the county — reflecting what a typical resident sees, not a simple ZIP average.
23.6% of adults age 25+ hold a bachelor's degree or higher (27,670 of 117,220 reporting).
16 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 48162 | Monroe | Standard | 28,156 | $67,876 | 59.0 | -2.0% |
| 48161 | Monroe | Standard | 26,304 | $67,414 | 45.2 | -1.5% |
| 48182 | Temperance | Standard | 20,179 | $84,375 | 40.0 | -5.2% |
| 48166 | Newport | Standard | 14,056 | $69,592 | 29.0 | 24.4% |
| 48160 | Milan | Standard | 13,972 | $103,453 | 79.6 | 3.4% |
| 48144 | Lambertville | Standard | 10,507 | $101,410 | 7.9 | 6.3% |
| 48117 | Carleton | Standard | 10,262 | $78,942 | 54.6 | 1.2% |
| 48131 | Dundee | Standard | 8,637 | $85,747 | 53.3 | 32.1% |
| 48133 | Erie | Standard | 7,085 | $74,388 | 27.4 | 22.0% |
| 49270 | Petersburg | Standard | 5,567 | $94,840 | 45.5 | -4.1% |
| 49267 | Ottawa Lake | Standard | 3,974 | $97,961 | 39.2 | 2.1% |
| 48140 | Ida | Standard | 3,664 | $109,257 | 27.5 | 5.5% |
| 48179 | South Rockwood | Standard | 3,209 | $77,095 | 21.1 | -4.9% |
| 48145 | La Salle | Standard | 2,904 | $83,204 | 17.0 | -18.4% |
| 48159 | Maybee | Standard | 2,578 | $74,519 | 32.3 | 3.8% |
| 48157 | Luna Pier | Standard | 1,244 | $61,641 | 1.1 | -11.0% |
| 48177 | Samaria | PO Box | 533 | $81,818 | 0.0 | 137.9% |
| 48110 | Azalia | PO Box | — | — | 0.0 | — |