Founded in 1817, Monroe County is one of 83 counties in the state of Michigan. Historically, Monroe County was formed from part of Wayne County. The city of Monroe is the county seat. With FIPS code of 115, Monroe County has a population of 155,274 and area of 680 square miles (1,761 km2).
List of all cities in Monroe County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Ash Township, MI | 48117 | 734 |
| Augusta Township, MI | 48160 | 734 |
| Azalia, MI | 48110 | 734 |
| Carleton, MI | 48117 | 734 |
| Cone, MI | 48160 | 734 |
| Duncan, MI | 48131 | 734 |
| Dundee, MI | 48131 | 734 |
| Erie, MI | 48133 | 734 |
| Frenchtown, MI | 48161 | 734 |
| Ida, MI | 48140 | 734 |
| La Salle, MI | 48145 | 734 |
| Lambertville, MI | 48144 | 734 |
| London Township, MI | 48160 | 734 |
| Luna Pier, MI | 48157 | 734 |
| Maybee, MI | 48159 | 734 |
| Milan, MI | 48160 | 734 |
| Monroe, MI | 48110 | 734 |
| 48161 | 734 | |
| 48162 | 734 | |
| Mooreville, MI | 48160 | 734 |
| Newport, MI | 48166 | 734 |
| Oakville, MI | 48160 | 734 |
| Ottawa Lake, MI | 49267 | 734 |
| Petersburg, MI | 49270 | 734 |
| Raisinville Township, MI | 48161 | 734 |
| Raisinvl Township, MI | 48161 | 734 |
| Rea, MI | 48131 | 734 |
| Samaria, MI | 48177 | 734 |
| South Rockwood, MI | 48179 | 734 |
| Stony Creek, MI | 48160 | 734 |
| Temperance, MI | 48182 | 734 |
| York Township, MI | 48160 | 734 |