| County : | Mercer County |
| State : | Illinois (IL) |
| Land Area : | 561.20 sq mi |
| Water Area : | 7.49 sq mi |
| Latitude : | 41.2047906 |
| Longitude : | -90.7414333 |
| Population (2010): | 16,434 |
| Population Estimate (2012) : | 16,421 |
| Population Density : | 29.28/sq mi |
| Housing Units (2012) : | 7,358 |
| Median Household Income (2012) : | $52,700 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $64,971 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $95,100 (Illinois : $190,800, USA : $181,400) |
Mercer County Cities / Towns
| Aledo City (3,640) | Alexis Village (831) | Joy Village (417) |
| Keithsburg City (609) | Matherville Village (723) | New Boston City (683) |
| North Henderson Village (187) | Reynolds Village (539) | Seaton Village (222) |
| Sherrard Village (640) | Viola Village (955) | Windsor Village (748) |
Mercer County Zip Codes
| 61231 (5,627) | 61260 (856) | 61262 (1,188) |
| 61263 (530) | 61264 (10,548) | 61272 (1,504) |
| 61276 (138) | 61279 (1,061) | 61281 (2,597) |
| 61412 (1,321) | 61442 (762) | 61465 (1,213) |
| 61466 (342) | 61476 (407) | 61486 (1,552) |