| | Deer Park, TX | Tomball, TX | United States |
| Population | 34,240 | 12,333 | 329,725,481 |
| Female Population | 49.2% | 54.0% | 50.5% |
| Male Population | 50.8% | 46.0% | 49.5% |
| Median Age | 36.9 | 37.7 | 38.4 |
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| Population - 2010 | 32,094 | 10,731 | 309,327,143 |
| Population - 2000 | 28,520 | 9,089 | 285,036,114 |
| Population - 1990 | 27,652 | 6,370 | 251,960,433 |
| Pop. 2000 to Now | 15.4% | 29.0% | 15.6% |
| Pop. 1990 to Now | 19.0% | 84.0% | 30.8% |
| space4 | | | |
| Population Density | 3,269.4 | 998.8 | 93.4 |
| Land Area | 10.5 | 12.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Deer Park, TX | Tomball, TX | United States |
| Age 0 to 4 | 6.3% | 6.2% | 5.9% |
| Age 5 to 9 | 6.7% | 5.1% | 6.1% |
| Age 10 to 14 | 6.2% | 5.1% | 6.6% |
| Age 15 to 17 | 5.7% | 5.4% | 3.9% |
| Age 18 to 20 | 4.4% | 5.7% | 4.0% |
| Age 21 to 24 | 7.1% | 5.1% | 5.2% |
| Age 25 to 34 | 10.8% | 12.8% | 13.8% |
| Age 35 to 44 | 13.7% | 12.3% | 12.9% |
| Age 45 to 54 | 12.2% | 9.6% | 12.6% |
| Age 55 to 59 | 6.9% | 4.8% | 6.7% |
| Age 60 to 64 | 4.8% | 7.2% | 6.3% |
| Age 65 to 74 | 9.7% | 10.2% | 9.6% |
| Age 75 to 84 | 3.9% | 6.4% | 4.5% |
| Age 85 and over | 1.5% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Deer Park, TX | Tomball, TX | United States |
| White | 56.1% | 60.7% | 59.4% |
| Black | 2.2% | 11.1% | 12.2% |
| Asian | 1.1% | 0.3% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 2.9% | 1.6% | 3.2% |
| Hispanic | 37.5% | 26.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Deer Park, TX | Tomball, TX | United States |
| Married Population | 56.7% | 48.9% | 49.8% |
| Currently Married | 55.0% | 44.9% | 48.0% |
| Married but Separated | 1.7% | 4.0% | 1.8% |
| Single Population | 43.3% | 51.1% | 50.2% |
| Never Married | 27.7% | 30.6% | 33.8% |
| Divorced | 9.3% | 12.8% | 10.8% |
| Widowed | 6.2% | 7.7% | 5.6% |
| space5 | | | |
| Household Size | 2.92 | 2.45 | 2.60 |
| Households | 11,682 | 4,877 | 124,010,992 |
| Family Households | 8,865 | 2,769 | 80,755,759 |
| Married couple, w/children | 37.0% | 40.1% | 30.5% |
| Married couple, no children | 42.2% | 38.2% | 42.9% |
| Non Family Households | 2,817 | 2,108 | 43,255,233 |
| Single householder, w/children | 13.3% | 16.3% | 15.8% |
| Single householder, no children | 7.6% | 5.5% | 10.8% |