Monroe County, Michigan
County seat: Monroe · Population 156,004 (2025) · 549 sq mi
Monroe County is the 15th most populous of Michigan's 83 counties, with 156,004 people (2025 estimate). Its county seat is Monroe. It is part of the Southeast (Region 9) region, one of the 10 Michigan prosperity regions. The map shows its 10 cities and towns and the 4 neighboring counties.
Monroe County facts
- County seat
- Monroe
- Population (2025 estimate)
- 156,004 +0.8% since 2020
- Land area
- 549 sq mi 60th largest of 83
- Water area
- 131 sq mi
- Population density
- 284 per sq mi
- Established
- 1817
- Same name
- One of 17 Monroe Counties in the US
- Named after
- James Monroe president of the United States from 1817 to 1825 (1758–1831)
- Largest city
- Bedford 32,013
- Median household income
- $77,335
- Cities and towns
- 10 plus 8 CDPs
- ZIP codes
- 25
- Time zone
- Eastern
- FIPS code
- 26115
Cities and towns in Monroe County
Monroe County has 10 incorporated cities, towns and villages. Populations count the people living inside Monroe County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Monroe (county seat) | City | 20,076 | |
| Dundee | Village | 6,008 | |
| Carleton | Village | 2,302 | |
| Milan | City | 2,247 | Washtenaw County |
| South Rockwood | Village | 1,576 | |
| Luna Pier | City | 1,351 | |
| Petersburg | City | 1,152 | |
| Maybee | Village | 578 | |
| Estral Beach | Village | 413 | |
| Flat Rock | City | 0 | Wayne County |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Lambertville | 9,955 | |
| Temperance | 8,914 | |
| South Monroe | 6,960 | |
| Detroit Beach | 2,771 | |
| West Monroe | 2,711 | |
| Woodland Beach | 1,919 | |
| Stony Point | 1,825 | |
| Ida | 1,050 |
ZIP codes in Monroe County
25 ZIP codes reach into Monroe County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 48111 also Wayne and Washtenaw counties
- 48117 also Wayne County
- 48131
- 48133
- 48134 also Wayne County
- 48140
- 48144
- 48145
- 48157
- 48159
- 48160 also Washtenaw County
- 48161
- 48162
- 48164 also Wayne County
- 48166
- 48177
- 48179
- 48182
- 48191 also Washtenaw County
- 49228 also Lenawee County
- 49229 also Lenawee and Washtenaw counties
- 49238 also Lenawee County
- 49267 also Lenawee County
- 49270
- 49276 also Lenawee County
Population of Monroe County, 2020–2025
Monroe County grew by 1,183 people (+0.8%) between April 2020 and July 2025: 2,040 more deaths than births and a net gain of 3,229 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 154,912 |
| 2021 | 155,587 |
| 2022 | 155,376 |
| 2023 | 155,563 |
| 2024 | 155,870 |
| 2025 | 156,004 |
Neighboring counties
- Lucas County, Ohio south · 423,347 people
- Wayne County northeast · 1,769,038 people
- Lenawee County west · 97,779 people
- Washtenaw County northwest · 370,214 people
Printable Monroe County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (170 KB)
- PNG (2400 px) (104 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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