Waterloo, Illinois
Waterloo, Illinois | |
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Monroe County Courthouse in the Waterloo Historic District | |
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Flag Logo | |
| Etymology: Battle of Waterloo | |
| Motto: "City Conveniences, Rural Advantages" | |
Interactive map of Waterloo, Illinois | |
Waterloo Waterloo | |
| Coordinates: 38°21′17″N 90°09′10″W / 38.35472°N 90.15278°W | |
| Country | United States |
| State | Illinois |
| County | Monroe |
| Precincts | 16, 17, 18, 19, 26, and 27 |
| Founded | 1818 |
| Chartered as town | 1849 |
| Incorporation | 1889 |
| Area | |
• Total | 8.31 sq mi (21.53 km2) |
| • Land | 8.18 sq mi (21.19 km2) |
| • Water | 0.14 sq mi (0.35 km2) |
| Elevation | 686 ft (209 m) |
| Population (2020) | |
• Total | 11,013 |
| • Density | 1,352.0/sq mi (522.02/km2) |
| Time zone | UTC-6 (CST) |
| • Summer (DST) | UTC-5 (CDT) |
| ZIP code | 62298 |
| Area code | 618 |
| FIPS code | 17-79150 |
| GNIS feature ID | 2397210 |
| Website | www |
Waterloo is a city in and county seat of Monroe County, Illinois, United States. The population was 11,013 at the 2020 census, up from 9,811 in 2010.