| City : | Waterloo City |
| County : | Adair County, Caledonia County, Jackson County, Monroe County |
| State : | Illinois (IL) |
| | |
| Land Area : | 7.52 sq mi |
| Water Area : | 0.14 sq mi |
| Latitude : | 38.3388856 |
| Longitude : | -90.1534884 |
| | |
| Population (2010): | 9,811 |
| Population Estimate (2012) : | 9,826 |
| Population Density : | 1,304.14/sq mi |
| Housing Units (2012) : | 4,046 |
| Median Household Income (2012) : | $71,714 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $84,179 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $184,900 (Illinois : $190,800, USA : $181,400) |