Monroe County, Illinois
Monroe County, Illinois | |
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Monroe County Courthouse in Waterloo | |
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Flag Seal Logo | |
Location within the U.S. state of Illinois | |
| Coordinates: 38°17′N 90°11′W / 38.28°N 90.18°W | |
| Country | United States |
| State | Illinois |
| Founded | 1816 |
| Named after | James Monroe |
| Seat | Waterloo |
| Largest city | Waterloo |
| Area | |
• Total | 398 sq mi (1,030 km2) |
| • Land | 385 sq mi (1,000 km2) |
| • Water | 13 sq mi (34 km2) 3.3% |
| Population (2020) | |
• Total | 34,962 |
• Estimate (2024) | 34,969 |
| • Density | 90.8/sq mi (35.1/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 12th |
| Website | monroecountyil |
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".