| | Lineville, AL | Summerville, GA | United States |
| Population | 2,598 | 4,389 | 329,725,481 |
| Female Population | 51.1% | 53.8% | 50.5% |
| Male Population | 48.9% | 46.2% | 49.5% |
| Median Age | 55.5 | 40.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,413 | 4,502 | 309,327,143 |
| Population - 2000 | 2,401 | 4,556 | 285,036,114 |
| Population - 1990 | 2,394 | 5,025 | 251,960,433 |
| Pop. 2000 to Now | -7.5% | -7.0% | 15.6% |
| Pop. 1990 to Now | -7.2% | -15.7% | 30.8% |
| space4 | | | |
| Population Density | 268.8 | 1,093.4 | 93.4 |
| Land Area | 9.7 | 4.0 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lineville, AL | Summerville, GA | United States |
| Age 0 to 4 | 6.5% | 8.4% | 5.9% |
| Age 5 to 9 | 2.3% | 7.1% | 6.1% |
| Age 10 to 14 | 5.7% | 6.3% | 6.6% |
| Age 15 to 17 | 3.0% | 2.9% | 3.9% |
| Age 18 to 20 | 2.1% | 1.9% | 4.0% |
| Age 21 to 24 | 0.8% | 3.2% | 5.2% |
| Age 25 to 34 | 8.6% | 10.0% | 13.8% |
| Age 35 to 44 | 8.5% | 11.1% | 12.9% |
| Age 45 to 54 | 11.5% | 13.0% | 12.6% |
| Age 55 to 59 | 12.7% | 8.2% | 6.7% |
| Age 60 to 64 | 11.7% | 9.9% | 6.3% |
| Age 65 to 74 | 14.3% | 10.3% | 9.6% |
| Age 75 to 84 | 8.5% | 3.3% | 4.5% |
| Age 85 and over | 4.0% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lineville, AL | Summerville, GA | United States |
| White | 61.6% | 75.7% | 59.4% |
| Black | 36.7% | 19.2% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 3.3% | 3.2% |
| Hispanic | 0.0% | 1.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lineville, AL | Summerville, GA | United States |
| Married Population | 49.0% | 36.0% | 49.8% |
| Currently Married | 46.7% | 34.0% | 48.0% |
| Married but Separated | 2.2% | 2.0% | 1.8% |
| Single Population | 51.0% | 64.0% | 50.2% |
| Never Married | 22.4% | 30.1% | 33.8% |
| Divorced | 13.8% | 24.9% | 10.8% |
| Widowed | 14.8% | 9.0% | 5.6% |
| space5 | | | |
| Household Size | 2.14 | 2.22 | 2.60 |
| Households | 1,168 | 1,889 | 124,010,992 |
| Family Households | 672 | 1,052 | 80,755,759 |
| Married couple, w/children | 15.2% | 16.5% | 30.5% |
| Married couple, no children | 53.4% | 32.9% | 42.9% |
| Non Family Households | 496 | 837 | 43,255,233 |
| Single householder, w/children | 22.6% | 35.2% | 15.8% |
| Single householder, no children | 8.8% | 15.4% | 10.8% |