06/30/2010 — Master site admin

| 2009 Est. Population by Age | Killeen | % | MSA | % | Texas % | US % |
|---|---|---|---|---|---|---|
| Total | 111,666 | 100 | 380,643 | 100 | 100 | 100 |
| Age 0-4 | 10,921 | 9.78 | 30,757 | 8.08 | 8.26 | 6.86 |
| Age 5-9 | 9,127 | 8.17 | 28,351 | 7.45 | 7.60 | 6.59 |
| Age 10-14 | 8,959 | 8.02 | 27,756 | 7.29 | 7.28 | 6.65 |
| Age 15-17 | 4,689 | 4.20 | 16,543 | 4.35 | 4.42 | 4.25 |
| Age 18-20 | 4,961 | 4.44 | 20,614 | 5.42 | 4.41 | 4.31 |
| Age 21-24 | 7,927 | 7.10 | 26,942 | 7.08 | 5.71 | 5.46 |
| Age 25-34 | 20,231 | 18.12 | 59,775 | 15.70 | 14.48 | 13.33 |
| Age 35-44 | 17,641 | 15.80 | 55,797 | 14.66 | 14.09 | 13.91 |
| Age 45-49 | 7,626 | 6.83 | 25,560 | 6.71 | 7.03 | 7.41 |
| Age 50-54 | 6,158 | 5.51 | 21,651 | 5.69 | 6.50 | 7.05 |
| Age 55-59 | 4,221 | 3.78 | 17,568 | 4.62 | 5.53 | 6.21 |
| Age 60-64 | 3,110 | 2.79 | 14,243 | 3.74 | 4.37 | 5.05 |
| Age 65-74 | 3,646 | 3.27 | 18,682 | 4.91 | 5.64 | 6.75 |
| Age 75-84 | 1,895 | 1.70 | 11,434 | 3.00 | 3.33 | 4.28 |
| Age 85 and over | 554 | 0.50 | 4,970 | 1.31 | 1.36 | 1.87 |
| Age 18 and over | 77,970 | 69.82 | 277,236 | 72.83 | 72.45 | 75.65 |
| Age 21 and over | 73,009 | 65.38 | 256,622 | 67.42 | 68.04 | 71.34 |
| Age 65 and Over | 6,095 | 5.46 | 35,086 | 9.22 | 10.33 | 12.91 |