| Zip Code : | 48879 |
| City : | St. Johns city |
| County : | Clinton County, Gratiot County |
| State : | Michigan (MI) |
| | |
| Land Area : | 189.06 sq mi |
| Water Area : | 0.80 sq mi |
| Latitude : | 43.0030167 |
| Longitude : | -84.5786678 |
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| Population (2010): | 18,075 |
| Population Estimate (2012) : | 18,143 |
| Population Density : | 95.60/sq mi |
| Housing Units (2012) : | 7,299 |
| Median Household Income (2012) : | $52,533 (Michigan : $48,471, USA : $53,046) |
| Median Family Income (2012) : | $65,245 (Michigan : $60,749, USA : $64,585) |
| Median House Price (2012) : | $145,400 (Michigan : $128,600, USA : $181,400) |