
Old Monroe
- County:
- Lincoln County
- County Seat:
- No
- Area (mi²):
- 0.362
- State:
- Missouri
Old Monroe is a city located in Lincoln County, Missouri. Old Monroe has a 2025 population of 281. Old Monroe is currently growing at a rate of 2.18% annually and its population has increased by 11.95% since the most recent census, which recorded a population of 251 in 2020.
The average household income in Old Monroe is $66,262 with a poverty rate of 4.42%. The median age in Old Monroe is 30.5 years: 24.8 years for males, and 33.7 years for females.