| | Jemison, AL | Seffner, FL | United States |
| Population | 2,631 | 8,484 | 329,725,481 |
| Female Population | 47.0% | 51.0% | 50.5% |
| Male Population | 53.0% | 49.0% | 49.5% |
| Median Age | 33.2 | 39.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,621 | 7,480 | 309,327,143 |
| Population - 2000 | 2,248 | 5,467 | 285,036,114 |
| Population - 1990 | 1,898 | 5,371 | 251,960,433 |
| Pop. 2000 to Now | 19.8% | 65.4% | 15.6% |
| Pop. 1990 to Now | 41.9% | 68.4% | 30.8% |
| space4 | | | |
| Population Density | 231.9 | 2,352.1 | 93.4 |
| Land Area | 11.3 | 3.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Jemison, AL | Seffner, FL | United States |
| Age 0 to 4 | 8.9% | 9.7% | 5.9% |
| Age 5 to 9 | 8.6% | 5.6% | 6.1% |
| Age 10 to 14 | 12.4% | 6.5% | 6.6% |
| Age 15 to 17 | 4.0% | 4.8% | 3.9% |
| Age 18 to 20 | 4.8% | 2.5% | 4.0% |
| Age 21 to 24 | 6.5% | 5.6% | 5.2% |
| Age 25 to 34 | 8.1% | 9.9% | 13.8% |
| Age 35 to 44 | 15.2% | 14.3% | 12.9% |
| Age 45 to 54 | 8.7% | 14.1% | 12.6% |
| Age 55 to 59 | 4.3% | 6.5% | 6.7% |
| Age 60 to 64 | 6.2% | 7.4% | 6.3% |
| Age 65 to 74 | 7.4% | 8.8% | 9.6% |
| Age 75 to 84 | 1.7% | 3.4% | 4.5% |
| Age 85 and over | 3.5% | 0.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Jemison, AL | Seffner, FL | United States |
| White | 76.0% | 55.3% | 59.4% |
| Black | 16.2% | 15.3% | 12.2% |
| Asian | 0.0% | 0.4% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.1% | 2.8% | 3.2% |
| Hispanic | 4.7% | 26.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Jemison, AL | Seffner, FL | United States |
| Married Population | 54.8% | 52.1% | 49.8% |
| Currently Married | 52.9% | 50.5% | 48.0% |
| Married but Separated | 1.9% | 1.6% | 1.8% |
| Single Population | 45.2% | 47.9% | 50.2% |
| Never Married | 28.2% | 31.5% | 33.8% |
| Divorced | 10.1% | 12.1% | 10.8% |
| Widowed | 6.9% | 4.4% | 5.6% |
| space5 | | | |
| Household Size | 2.92 | 3.07 | 2.60 |
| Households | 902 | 2,746 | 124,010,992 |
| Family Households | 641 | 2,122 | 80,755,759 |
| Married couple, w/children | 36.3% | 28.2% | 30.5% |
| Married couple, no children | 39.2% | 47.2% | 42.9% |
| Non Family Households | 261 | 624 | 43,255,233 |
| Single householder, w/children | 20.6% | 15.7% | 15.8% |
| Single householder, no children | 3.9% | 8.9% | 10.8% |