| | Brownsville, TN | Arlington, TN | United States |
| Population | 9,807 | 14,158 | 329,725,481 |
| Female Population | 52.8% | 51.3% | 50.5% |
| Male Population | 47.2% | 48.7% | 49.5% |
| Median Age | 39.9 | 35.2 | 38.4 |
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| Population - 2010 | 10,340 | 11,522 | 309,327,143 |
| Population - 2000 | 10,748 | 2,569 | 285,036,114 |
| Population - 1990 | 10,019 | 1,541 | 251,960,433 |
| Pop. 2000 to Now | -14.1% | 357.3% | 15.6% |
| Pop. 1990 to Now | -7.9% | 662.4% | 30.8% |
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| Population Density | 994.7 | 615.2 | 93.4 |
| Land Area | 9.9 | 23.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Brownsville, TN | Arlington, TN | United States |
| Age 0 to 4 | 6.6% | 6.7% | 5.9% |
| Age 5 to 9 | 6.6% | 7.5% | 6.1% |
| Age 10 to 14 | 6.9% | 12.7% | 6.6% |
| Age 15 to 17 | 5.1% | 5.9% | 3.9% |
| Age 18 to 20 | 3.9% | 4.4% | 4.0% |
| Age 21 to 24 | 3.4% | 3.4% | 5.2% |
| Age 25 to 34 | 12.8% | 9.2% | 13.8% |
| Age 35 to 44 | 11.7% | 17.5% | 12.9% |
| Age 45 to 54 | 12.7% | 14.9% | 12.6% |
| Age 55 to 59 | 5.1% | 6.0% | 6.7% |
| Age 60 to 64 | 8.1% | 4.2% | 6.3% |
| Age 65 to 74 | 9.6% | 5.6% | 9.6% |
| Age 75 to 84 | 4.9% | 1.5% | 4.5% |
| Age 85 and over | 2.4% | 0.5% | 1.9% |
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| Race | | | |
| | Brownsville, TN | Arlington, TN | United States |
| White | 27.2% | 76.8% | 59.4% |
| Black | 65.8% | 16.6% | 12.2% |
| Asian | 0.0% | 0.4% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 3.6% | 3.2% |
| Hispanic | 5.1% | 2.6% | 18.4% |
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| Marriage & Family | | | |
| | Brownsville, TN | Arlington, TN | United States |
| Married Population | 37.4% | 62.6% | 49.8% |
| Currently Married | 33.1% | 62.3% | 48.0% |
| Married but Separated | 4.4% | 0.4% | 1.8% |
| Single Population | 62.6% | 37.4% | 50.2% |
| Never Married | 39.0% | 24.2% | 33.8% |
| Divorced | 15.2% | 8.1% | 10.8% |
| Widowed | 8.3% | 5.0% | 5.6% |
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| Household Size | 2.51 | 3.23 | 2.60 |
| Households | 3,869 | 4,383 | 124,010,992 |
| Family Households | 2,374 | 3,763 | 80,755,759 |
| Married couple, w/children | 15.6% | 49.5% | 30.5% |
| Married couple, no children | 34.8% | 32.6% | 42.9% |
| Non Family Households | 1,495 | 620 | 43,255,233 |
| Single householder, w/children | 32.6% | 14.3% | 15.8% |
| Single householder, no children | 17.0% | 3.5% | 10.8% |