| County : | Warren County |
| State : | Illinois (IL) |
| Land Area : | 542.40 sq mi |
| Water Area : | 0.65 sq mi |
| Latitude : | 40.8504412 |
| Longitude : | -90.6202228 |
| Population (2010): | 17,707 |
| Population Estimate (2012) : | 17,723 |
| Population Density : | 32.65/sq mi |
| Housing Units (2012) : | 7,682 |
| Median Household Income (2012) : | $41,138 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $50,044 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $83,000 (Illinois : $190,800, USA : $181,400) |
Warren County Cities / Towns
| Alexis Village (831) | Avon Village (799) | Kirkwood Village (714) |
| Little York Village (331) | Monmouth City (9,444) | Roseville Village (989) |
Warren County Zip Codes
| 61401 (34,788) | 61410 (3,912) | 61412 (1,321) |
| 61415 (1,747) | 61417 (259) | 61423 (682) |
| 61435 (116) | 61447 (924) | 61453 (781) |
| 61462 (11,643) | 61473 (1,667) | 61474 (292) |
| 61475 (205) | 61478 (290) |