| County : | St. Clair County |
| State : | Michigan (MI) |
| Land Area : | 721.17 sq mi |
| Water Area : | 115.34 sq mi |
| Latitude : | 42.9288035 |
| Longitude : | -82.6689135 |
| Population (2010): | 163,040 |
| Population Estimate (2012) : | 162,978 |
| Population Density : | 226.08/sq mi |
| Housing Units (2012) : | 71,822 |
| Median Household Income (2012) : | $47,877 (Michigan : $48,471, USA : $53,046) |
| Median Family Income (2012) : | $58,890 (Michigan : $60,749, USA : $64,585) |
| Median House Price (2012) : | $131,900 (Michigan : $128,600, USA : $181,400) |
St. Clair County Cities / Towns
| Algonac City (4,110) | Capac Village (1,890) | Emmett Village (269) |
| Marine City (4,248) | Marysville City (9,959) | Memphis City (1,183) |
| Pearl Beach (2,829) | Port Huron City (30,184) | Richmond City (5,735) |
| St. Clair City (5,485) | Yale City (1,955) |
St. Clair County Zip Codes
| 48001 (11,986) | 48002 (3,285) | 48006 (4,007) |
| 48014 (4,256) | 48022 (2,654) | 48023 (5,178) |
| 48027 (3,249) | 48028 (1,190) | 48032 (2,322) |
| 48039 (7,807) | 48040 (9,956) | 48041 (4,561) |
| 48049 (5,582) | 48054 (7,339) | 48059 (15,123) |
| 48060 (40,831) | 48063 (4,070) | 48064 (4,107) |
| 48074 (9,356) | 48079 (12,304) | 48097 (5,499) |
| 48416 (5,002) | 48444 (9,327) |