| City : | Mount Vernon City |
| County : | Lafayette County, Linn County |
| State : | Iowa (IA) |
| | |
| Land Area : | 3.49 sq mi |
| Water Area : | 0.01 sq mi |
| Latitude : | 41.9236498 |
| Longitude : | -91.4237629 |
| | |
| Population (2010): | 4,506 |
| Population Estimate (2012) : | 4,498 |
| Population Density : | 1,290.16/sq mi |
| Housing Units (2012) : | 1,397 |
| Median Household Income (2012) : | $70,960 (Iowa : $51,129, USA : $53,046) |
| Median Family Income (2012) : | $89,667 (Iowa : $64,772, USA : $64,585) |
| Median House Price (2012) : | $180,700 (Iowa : $123,000, USA : $181,400) |