| | Bradford, IL | Seffner, FL | United States |
| Population | 710 | 8,484 | 329,725,481 |
| Female Population | 56.2% | 51.0% | 50.5% |
| Male Population | 43.8% | 49.0% | 49.5% |
| Median Age | 44.7 | 39.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 763 | 7,480 | 309,327,143 |
| Population - 2000 | 787 | 5,467 | 285,036,114 |
| Population - 1990 | 678 | 5,371 | 251,960,433 |
| Pop. 2000 to Now | -15.1% | 65.4% | 15.6% |
| Pop. 1990 to Now | -1.5% | 68.4% | 30.8% |
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| Population Density | 1,783.9 | 2,352.1 | 93.4 |
| Land Area | 0.4 | 3.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Bradford, IL | Seffner, FL | United States |
| Age 0 to 4 | 4.5% | 9.7% | 5.9% |
| Age 5 to 9 | 7.7% | 5.6% | 6.1% |
| Age 10 to 14 | 5.1% | 6.5% | 6.6% |
| Age 15 to 17 | 4.2% | 4.8% | 3.9% |
| Age 18 to 20 | 0.6% | 2.5% | 4.0% |
| Age 21 to 24 | 8.6% | 5.6% | 5.2% |
| Age 25 to 34 | 9.6% | 9.9% | 13.8% |
| Age 35 to 44 | 10.0% | 14.3% | 12.9% |
| Age 45 to 54 | 10.6% | 14.1% | 12.6% |
| Age 55 to 59 | 9.9% | 6.5% | 6.7% |
| Age 60 to 64 | 10.8% | 7.4% | 6.3% |
| Age 65 to 74 | 7.2% | 8.8% | 9.6% |
| Age 75 to 84 | 8.0% | 3.4% | 4.5% |
| Age 85 and over | 3.2% | 0.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bradford, IL | Seffner, FL | United States |
| White | 96.5% | 55.3% | 59.4% |
| Black | 1.4% | 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 | 0.6% | 2.8% | 3.2% |
| Hispanic | 1.5% | 26.1% | 18.4% |
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| Marriage & Family | | | |
| | Bradford, IL | Seffner, FL | United States |
| Married Population | 42.9% | 52.1% | 49.8% |
| Currently Married | 42.9% | 50.5% | 48.0% |
| Married but Separated | 0.0% | 1.6% | 1.8% |
| Single Population | 57.1% | 47.9% | 50.2% |
| Never Married | 31.9% | 31.5% | 33.8% |
| Divorced | 19.4% | 12.1% | 10.8% |
| Widowed | 5.8% | 4.4% | 5.6% |
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| Household Size | 2.40 | 3.07 | 2.60 |
| Households | 296 | 2,746 | 124,010,992 |
| Family Households | 185 | 2,122 | 80,755,759 |
| Married couple, w/children | 19.5% | 28.2% | 30.5% |
| Married couple, no children | 48.1% | 47.2% | 42.9% |
| Non Family Households | 111 | 624 | 43,255,233 |
| Single householder, w/children | 17.8% | 15.7% | 15.8% |
| Single householder, no children | 14.6% | 8.9% | 10.8% |