| City : | Fairfield City |
| County : | Jefferson County |
| State : | Iowa (IA) |
| Land Area : | 6.26 sq mi |
| Water Area : | 0.16 sq mi |
| Latitude : | 41.0068799 |
| Longitude : | -91.9671367 |
| Population (2010): | 9,464 |
| Population Estimate (2012) : | 9,462 |
| Population Density : | 1,511.26/sq mi |
| Housing Units (2012) : | 4,650 |
| Median Household Income (2012) : | $43,919 (Iowa : $51,129, USA : $53,046) |
| Median Family Income (2012) : | $55,279 (Iowa : $64,772, USA : $64,585) |
| Median House Price (2012) : | $82,900 (Iowa : $123,000, USA : $181,400) |