| County : | Marion County |
| State : | Illinois (IL) |
| Land Area : | 572.36 sq mi |
| Water Area : | 3.67 sq mi |
| Latitude : | 38.6483956 |
| Longitude : | -88.9202214 |
| Population (2010): | 39,437 |
| Population Estimate (2012) : | 39,319 |
| Population Density : | 68.90/sq mi |
| Housing Units (2012) : | 18,296 |
| Median Household Income (2012) : | $41,723 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $53,636 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $71,800 (Illinois : $190,800, USA : $181,400) |
Marion County Cities / Towns
| Alma Village (320) | Central City Village (1,172) | Centralia City (13,032) |
| Iuka Village (489) | Junction City Village (482) | Kell Village (219) |
| Kinmundy City (796) | Odin Village (1,076) | Patoka Village (584) |
| Salem City (7,485) | Sandoval Village (1,274) | Vernon Village (129) |
| Walnut Hill Village (108) | Wamac City (1,185) |
Marion County Zip Codes
| 62801 (22,415) | 62807 (961) | 62830 (1,392) |
| 62838 (1,497) | 62849 (2,205) | 62851 (329) |
| 62853 (1,034) | 62854 (1,776) | 62870 (2,080) |
| 62875 (1,167) | 62881 (11,385) | 62882 (2,331) |
| 62889 (851) | 62892 (317) | 62893 (977) |