| County : | Williamson County |
| State : | Illinois (IL) |
| Land Area : | 420.15 sq mi |
| Water Area : | 24.20 sq mi |
| Latitude : | 37.7303533 |
| Longitude : | -88.9300182 |
| Population (2010): | 66,357 |
| Population Estimate (2012) : | 66,335 |
| Population Density : | 157.94/sq mi |
| Housing Units (2012) : | 30,359 |
| Median Household Income (2012) : | $41,596 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $52,054 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $90,300 (Illinois : $190,800, USA : $181,400) |
Williamson County Cities / Towns
| Bush Village (275) | Cambria Village (1,228) | Carterville City (5,496) |
| Colp Village (225) | Crab Orchard (333) | Crainville Village (1,254) |
| Creal Springs City (543) | Energy Village (1,146) | Freeman Spur Village (287) |
| Herrin City (12,501) | Hurst City (795) | Johnston City (3,543) |
| Marion City (17,193) | Pittsburg Village (572) | Spillertown Village (203) |
| Stonefort Village (297) | Whiteash Village (241) |
Williamson County Zip Codes
| 62841 (98) | 62890 (2,882) | 62896 (12,626) |
| 62901 (27,182) | 62902 (4,531) | 62915 (321) |
| 62917 (2,305) | 62918 (9,793) | 62921 (375) |
| 62922 (3,119) | 62924 (2,809) | 62933 (1,230) |
| 62939 (3,119) | 62948 (12,865) | 62949 (810) |
| 62951 (5,352) | 62958 (2,262) | 62959 (26,948) |
| 62974 (1,401) | 62987 (1,174) |