| City : | Alton City |
| County : | Madison County |
| State : | Illinois (IL) |
| Land Area : | 15.47 sq mi |
| Water Area : | 1.27 sq mi |
| Latitude : | 38.9021254 |
| Longitude : | -90.1540833 |
| Population (2010): | 27,865 |
| Population Estimate (2012) : | 27,868 |
| Population Density : | 1,801.22/sq mi |
| Housing Units (2012) : | 13,266 |
| Median Household Income (2012) : | $35,776 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $43,018 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $85,000 (Illinois : $190,800, USA : $181,400) |