| County : | Jersey County |
| State : | Illinois (IL) |
| Land Area : | 369.27 sq mi |
| Water Area : | 7.86 sq mi |
| Latitude : | 39.0801918 |
| Longitude : | -90.3613647 |
| Population (2010): | 22,985 |
| Population Estimate (2012) : | 22,939 |
| Population Density : | 62.24/sq mi |
| Housing Units (2012) : | 9,848 |
| Median Household Income (2012) : | $53,692 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $63,436 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $118,900 (Illinois : $190,800, USA : $181,400) |
Jersey County Cities / Towns
| Brighton Village (2,254) | Elsah Village (673) | Fidelity Village (114) |
| Fieldon Village (239) | Grafton City (674) | Jerseyville City (8,465) |
| Medora Village (419) | Otterville Town (126) |
Jersey County Zip Codes
| 62012 (6,654) | 62022 (1,138) | 62028 (1,276) |
| 62030 (114) | 62031 (970) | 62035 (16,494) |
| 62037 (1,993) | 62052 (13,002) | 62054 (872) |
| 62063 (1,214) | 62079 (256) |