| PEOPLE | Killeen | Apex | United States |
| Population | 127,921 | 37,476 | 308,035,306 |
| Pop. Density | 2,387 | 2,438 | 87 |
| Pop. Change | 46.62% | 73.82% | 8.07% |
| Median Age | 27.3 | 34.3 | 37.3 |
| Households | 48,052 | 13,225 | 116,716,292 |
| Household Size | 2.67 | 2.85 | 2.58 |
| Male Population | 49.01% | 48.65% | 49.27% |
| Female Population | 50.99% | 51.35% | 50.96% |
| Married Population | 51.30% | 64.35% | 47.02% |
| Single Population | 48.70% | 35.65% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 10.57% | 8.51% | 6.56% |
| Age 5 to 9 | 8.39% | 10.20% | 6.61% |
| Age 10 to 14 | 7.21% | 9.28% | 6.71% |
| Age 15 to 17 | 4.25% | 4.99% | 4.21% |
| Age 18 to 20 | 2.77% | 1.68% | 2.95% |
| Age 21 to 24 | 11.28% | 3.50% | 7.01% |
| Age 25 to 34 | 20.67% | 12.91% | 13.33% |
| Age 35 to 44 | 12.79% | 20.89% | 13.33% |
| Age 45 to 49 | 10.50% | 15.51% | 14.61% |
| Age 50 to 54 | 10.50% | 15.51% | 14.61% |
| Age 55 to 59 | 6.40% | 6.88% | 11.84% |
| Age 60 to 64 | 6.40% | 6.88% | 11.84% |
| Age 65 to 74 | 3.18% | 3.31% | 7.05% |
| Age 75 to 84 | 1.58% | 1.63% | 4.24% |
| Age 85 and over | 0.41% | 0.71% | 1.78% |
| RACE | | | |
| White | 45.13% | 79.51% | 72.41% |
| Black | 34.09% | 7.64% | 12.61% |
| Asian | 3.99% | 7.08% | 4.75% |
| American Indian | 0.81% | 0.28% | 0.95% |
| Other | 15.97% | 5.50% | 9.28% |
| Hispanic | 0.59% | 2.26% | 16.35% |
| Non-Hispanic | 99.41% | 97.74% | 83.65% |
| FAMILY | | | |
| Married, w/children | 35.68% | 53.53% | 30.42% |
| Married, no children | 32.37% | 30.09% | 42.46% |
| Single, w/children | 22.16% | 10.89% | 14.39% |
| Single, no children | 9.79% | 5.48% | 12.73% |
| Divorced | 13.60% | 7.79% | 10.62% |
| Separated | 9.14% | 3.29% | 4.97% |
| Widowed | 3.55% | 3.15% | 6.14% |
| Now Married | 51.37% | 63.95% | 46.32% |
| Never Married | 22.33% | 21.83% | 31.95% |
