County
· Illinois
Monroe County
Monroe County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 34,962. Its county seat and largest city is Waterloo. Monroe County is included in the St. Louis, MO-IL Metropolitan Statistical Area. It is located in the southern portion of Illinois known historically as "Little Egypt".
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Cities and towns 6
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 102552
- FIPS state
- 17
- FIPS county
- 133
- FIPS place
- 99133
- Census record name
- COUNTY OF MONROE
- Mailing address
- 100 S MAIN ST, WATERLOO 62298