| City : | Johnston City |
| County : | Williamson County |
| State : | Illinois (IL) |
| | |
| Land Area : | 2.06 sq mi |
| Water Area : | 0.06 sq mi |
| Latitude : | 37.8210345 |
| Longitude : | -88.9292950 |
| | |
| Population (2010): | 3,543 |
| Population Estimate (2012) : | 3,557 |
| Population Density : | 1,715.90/sq mi |
| Housing Units (2012) : | 1,696 |
| Median Household Income (2012) : | $38,164 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $36,131 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $54,600 (Illinois : $190,800, USA : $181,400) |