Monroe County | |
---|---|
![]() Monroe County Courthouse in Waterloo | |
![]() Location within the U.S. state of Illinois | |
![]() Illinois's location within the U.S. | |
Coordinates: 38°17′N 90°11′W / 38.28°N 90.18°W | |
Country | ![]() |
State | ![]() |
Founded | 1816 |
Named for | 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 (30 km2) 3.3% |
Population (2020) | |
• Total | 34,962 |
• Density | 88/sq mi (34/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.[1] Its county seat and largest city is Waterloo.[2]
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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