| City : | Marion City |
| County : | Johnson County, Williamson County |
| State : | Illinois (IL) |
| | |
| Land Area : | 15.99 sq mi |
| Water Area : | 0.23 sq mi |
| Latitude : | 37.7161346 |
| Longitude : | -88.9256496 |
| | |
| Population (2010): | 17,193 |
| Population Estimate (2012) : | 17,198 |
| Population Density : | 1,075.46/sq mi |
| Housing Units (2012) : | 8,273 |
| Median Household Income (2012) : | $38,260 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $50,785 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $100,800 (Illinois : $190,800, USA : $181,400) |