| City : | Herrin City |
| County : | Williamson County |
| State : | Illinois (IL) |
| | |
| Land Area : | 9.23 sq mi |
| Water Area : | 0.23 sq mi |
| Latitude : | 37.7983893 |
| Longitude : | -89.0306502 |
| | |
| Population (2010): | 12,501 |
| Population Estimate (2012) : | 12,524 |
| Population Density : | 1,353.70/sq mi |
| Housing Units (2012) : | 5,751 |
| Median Household Income (2012) : | $39,123 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $48,164 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $75,600 (Illinois : $190,800, USA : $181,400) |