| | Nolanville, TX | Harker Heights, TX | United States |
| Population | 5,817 | 32,320 | 329,725,481 |
| Female Population | 46.7% | 50.2% | 50.5% |
| Male Population | 53.3% | 49.9% | 49.5% |
| Median Age | 33.3 | 33.8 | 38.4 |
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| Population - 2010 | 4,572 | 26,978 | 309,327,143 |
| Population - 2000 | 2,150 | 17,308 | 285,036,114 |
| Population - 1990 | 1,834 | 12,841 | 251,960,433 |
| Pop. 2000 to Now | 186.1% | 91.1% | 15.6% |
| Pop. 1990 to Now | 235.3% | 157.5% | 30.8% |
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| Population Density | 1,382.4 | 2,065.8 | 93.4 |
| Land Area | 4.2 | 15.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Nolanville, TX | Harker Heights, TX | United States |
| Age 0 to 4 | 5.0% | 6.1% | 5.9% |
| Age 5 to 9 | 11.5% | 8.5% | 6.1% |
| Age 10 to 14 | 7.2% | 8.6% | 6.6% |
| Age 15 to 17 | 5.3% | 5.3% | 3.9% |
| Age 18 to 20 | 3.6% | 4.8% | 4.0% |
| Age 21 to 24 | 6.6% | 3.5% | 5.2% |
| Age 25 to 34 | 13.8% | 14.1% | 13.8% |
| Age 35 to 44 | 16.3% | 17.6% | 12.9% |
| Age 45 to 54 | 14.6% | 11.2% | 12.6% |
| Age 55 to 59 | 3.8% | 6.8% | 6.7% |
| Age 60 to 64 | 3.7% | 3.8% | 6.3% |
| Age 65 to 74 | 6.9% | 7.1% | 9.6% |
| Age 75 to 84 | 1.6% | 1.8% | 4.5% |
| Age 85 and over | 0.0% | 0.9% | 1.9% |
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| Race | | | |
| | Nolanville, TX | Harker Heights, TX | United States |
| White | 63.8% | 44.2% | 59.4% |
| Black | 14.2% | 25.8% | 12.2% |
| Asian | 1.0% | 3.6% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 1.5% | 0.5% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.9% | 6.0% | 3.2% |
| Hispanic | 18.6% | 19.5% | 18.4% |
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| Marriage & Family | | | |
| | Nolanville, TX | Harker Heights, TX | United States |
| Married Population | 50.5% | 50.2% | 49.8% |
| Currently Married | 46.7% | 48.1% | 48.0% |
| Married but Separated | 3.8% | 2.1% | 1.8% |
| Single Population | 49.5% | 49.8% | 50.2% |
| Never Married | 27.6% | 32.9% | 33.8% |
| Divorced | 17.2% | 13.1% | 10.8% |
| Widowed | 4.8% | 3.8% | 5.6% |
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| Household Size | 2.64 | 2.81 | 2.60 |
| Households | 2,206 | 11,426 | 124,010,992 |
| Family Households | 1,540 | 8,211 | 80,755,759 |
| Married couple, w/children | 23.3% | 34.0% | 30.5% |
| Married couple, no children | 41.5% | 31.7% | 42.9% |
| Non Family Households | 666 | 3,215 | 43,255,233 |
| Single householder, w/children | 29.9% | 26.0% | 15.8% |
| Single householder, no children | 5.3% | 8.3% | 10.8% |