
Petersburg
- County:
- Monroe County
- County Seat:
- No
- Area (mi²):
- 0.483
- State:
- Michigan
Petersburg is a city located in Monroe County, Michigan. Petersburg has a 2025 population of 1,146. Petersburg is currently declining at a rate of -0.43% annually and its population has decreased by -2.05% since the most recent census, which recorded a population of 1,170 in 2020.
The average household income in Petersburg is $87,060 with a poverty rate of 3.98%. The median age in Petersburg is 39.2 years: 34.2 years for males, and 41.2 years for females.