| | Southgate, MI | Alpharetta, GA | United States |
| Population | 29,990 | 65,187 | 329,725,481 |
| Female Population | 52.0% | 50.1% | 50.5% |
| Male Population | 48.1% | 50.0% | 49.5% |
| Median Age | 42.1 | 40.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 29,977 | 57,694 | 309,327,143 |
| Population - 2000 | 30,136 | 34,854 | 285,036,114 |
| Population - 1990 | 30,771 | 13,002 | 251,960,433 |
| Pop. 2000 to Now | -3.3% | 94.8% | 15.6% |
| Pop. 1990 to Now | -5.3% | 422.2% | 30.8% |
| space4 | | | |
| Population Density | 4,362.2 | 2,423.4 | 93.4 |
| Land Area | 6.9 | 26.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Southgate, MI | Alpharetta, GA | United States |
| Age 0 to 4 | 5.5% | 5.3% | 5.9% |
| Age 5 to 9 | 5.2% | 7.4% | 6.1% |
| Age 10 to 14 | 5.6% | 8.8% | 6.6% |
| Age 15 to 17 | 2.5% | 4.4% | 3.9% |
| Age 18 to 20 | 2.2% | 3.2% | 4.0% |
| Age 21 to 24 | 5.5% | 3.5% | 5.2% |
| Age 25 to 34 | 16.2% | 9.9% | 13.8% |
| Age 35 to 44 | 11.4% | 14.5% | 12.9% |
| Age 45 to 54 | 12.8% | 17.7% | 12.6% |
| Age 55 to 59 | 6.9% | 8.6% | 6.7% |
| Age 60 to 64 | 8.0% | 6.3% | 6.3% |
| Age 65 to 74 | 10.9% | 6.3% | 9.6% |
| Age 75 to 84 | 4.9% | 2.6% | 4.5% |
| Age 85 and over | 2.4% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Southgate, MI | Alpharetta, GA | United States |
| White | 78.7% | 53.6% | 59.4% |
| Black | 6.2% | 11.8% | 12.2% |
| Asian | 2.3% | 21.9% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.7% | 0.4% |
| Two or More Races | 2.4% | 3.5% | 3.2% |
| Hispanic | 10.4% | 7.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Southgate, MI | Alpharetta, GA | United States |
| Married Population | 45.1% | 62.5% | 49.8% |
| Currently Married | 43.9% | 61.7% | 48.0% |
| Married but Separated | 1.1% | 0.7% | 1.8% |
| Single Population | 54.9% | 37.5% | 50.2% |
| Never Married | 34.3% | 25.8% | 33.8% |
| Divorced | 13.2% | 8.1% | 10.8% |
| Widowed | 7.5% | 3.7% | 5.6% |
| space5 | | | |
| Household Size | 2.38 | 2.75 | 2.60 |
| Households | 12,566 | 23,626 | 124,010,992 |
| Family Households | 7,562 | 17,769 | 80,755,759 |
| Married couple, w/children | 24.3% | 41.9% | 30.5% |
| Married couple, no children | 44.4% | 43.7% | 42.9% |
| Non Family Households | 5,004 | 5,857 | 43,255,233 |
| Single householder, w/children | 18.1% | 10.3% | 15.8% |
| Single householder, no children | 13.2% | 4.1% | 10.8% |