| City : | Mascoutah City |
| County : | St. Clair County |
| State : | Illinois (IL) |
| Land Area : | 9.50 sq mi |
| Water Area : | 0.15 sq mi |
| Latitude : | 38.5180942 |
| Longitude : | -89.8001589 |
| Population (2010): | 7,483 |
| Population Estimate (2012) : | 7,578 |
| Population Density : | 787.96/sq mi |
| Housing Units (2012) : | 3,038 |
| Median Household Income (2012) : | $64,788 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $76,464 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $144,500 (Illinois : $190,800, USA : $181,400) |