| City : | Troy City |
| County : | Madison County |
| State : | Illinois (IL) |
| Land Area : | 5.29 sq mi |
| Water Area : | 0.06 sq mi |
| Latitude : | 38.7305193 |
| Longitude : | -89.8917058 |
| Population (2010): | 9,888 |
| Population Estimate (2012) : | 9,959 |
| Population Density : | 1,868.95/sq mi |
| Housing Units (2012) : | 3,960 |
| Median Household Income (2012) : | $68,297 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $90,094 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $170,300 (Illinois : $190,800, USA : $181,400) |