| | Brownsville, TX | Fairfield, OH | United States |
| Population | 185,849 | 44,550 | 329,725,481 |
| Female Population | 51.7% | 52.3% | 50.5% |
| Male Population | 48.4% | 47.7% | 49.5% |
| Median Age | 31 | 39.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 175,073 | 42,556 | 309,327,143 |
| Population - 2000 | 139,722 | 42,097 | 285,036,114 |
| Population - 1990 | 98,962 | 39,729 | 251,960,433 |
| Pop. 2000 to Now | 31.3% | 1.2% | 15.6% |
| Pop. 1990 to Now | 85.4% | 7.2% | 30.8% |
| space4 | | | |
| Population Density | 1,404.6 | 2,130.6 | 93.4 |
| Land Area | 132.3 | 20.9 | 3,531,905.4 |
| Water Area | 13.8 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Brownsville, TX | Fairfield, OH | United States |
| Age 0 to 4 | 8.1% | 6.5% | 5.9% |
| Age 5 to 9 | 8.1% | 5.1% | 6.1% |
| Age 10 to 14 | 8.0% | 6.5% | 6.6% |
| Age 15 to 17 | 5.2% | 4.2% | 3.9% |
| Age 18 to 20 | 5.6% | 3.3% | 4.0% |
| Age 21 to 24 | 6.9% | 5.0% | 5.2% |
| Age 25 to 34 | 12.6% | 12.9% | 13.8% |
| Age 35 to 44 | 12.5% | 13.0% | 12.9% |
| Age 45 to 54 | 11.6% | 11.2% | 12.6% |
| Age 55 to 59 | 5.0% | 7.7% | 6.7% |
| Age 60 to 64 | 4.4% | 7.6% | 6.3% |
| Age 65 to 74 | 7.1% | 9.6% | 9.6% |
| Age 75 to 84 | 3.3% | 4.3% | 4.5% |
| Age 85 and over | 1.6% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Brownsville, TX | Fairfield, OH | United States |
| White | 4.3% | 66.6% | 59.4% |
| Black | 0.2% | 15.7% | 12.2% |
| Asian | 0.5% | 5.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 1.2% | 0.4% |
| Two or More Races | 0.2% | 3.8% | 3.2% |
| Hispanic | 94.7% | 7.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Brownsville, TX | Fairfield, OH | United States |
| Married Population | 51.9% | 49.7% | 49.8% |
| Currently Married | 47.6% | 48.7% | 48.0% |
| Married but Separated | 4.3% | 1.1% | 1.8% |
| Single Population | 48.2% | 50.3% | 50.2% |
| Never Married | 34.2% | 29.1% | 33.8% |
| Divorced | 7.8% | 13.7% | 10.8% |
| Widowed | 6.2% | 7.4% | 5.6% |
| space5 | | | |
| Household Size | 3.31 | 2.40 | 2.60 |
| Households | 55,793 | 18,342 | 124,010,992 |
| Family Households | 44,044 | 11,730 | 80,755,759 |
| Married couple, w/children | 36.5% | 29.9% | 30.5% |
| Married couple, no children | 26.3% | 42.4% | 42.9% |
| Non Family Households | 11,749 | 6,612 | 43,255,233 |
| Single householder, w/children | 23.6% | 16.6% | 15.8% |
| Single householder, no children | 13.6% | 11.0% | 10.8% |