| PEOPLE | Kelso | United States |
| Population | 11,925 | 308,035,306 |
| Pop. Density | 1,465 | 87 |
| Pop. Change | -0.72% | 8.07% |
| Median Age | 34.6 | 37.3 |
| Households | 4,720 | 116,716,292 |
| Household Size | 2.52 | 2.58 |
| Male Population | 48.83% | 49.27% |
| Female Population | 51.17% | 50.96% |
| Married Population | 39.69% | 47.02% |
| Single Population | 60.31% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | |
| Age 0 to 4 | 7.93% | 6.56% |
| Age 5 to 9 | 6.73% | 6.61% |
| Age 10 to 14 | 7.07% | 6.71% |
| Age 15 to 17 | 4.59% | 4.21% |
| Age 18 to 20 | 2.94% | 2.95% |
| Age 21 to 24 | 7.45% | 7.01% |
| Age 25 to 34 | 13.88% | 13.33% |
| Age 35 to 44 | 12.91% | 13.33% |
| Age 45 to 49 | 13.72% | 14.61% |
| Age 50 to 54 | 13.72% | 14.61% |
| Age 55 to 59 | 11.14% | 11.84% |
| Age 60 to 64 | 11.14% | 11.84% |
| Age 65 to 74 | 6.32% | 7.05% |
| Age 75 to 84 | 3.98% | 4.24% |
| Age 85 and over | 1.35% | 1.78% |
| RACE | | |
| White | 85.21% | 72.41% |
| Black | 0.81% | 12.61% |
| Asian | 1.58% | 4.75% |
| American Indian | 2.10% | 0.95% |
| Other | 10.29% | 9.28% |
| Hispanic | 2.35% | 16.35% |
| Non-Hispanic | 97.65% | 83.65% |
| FAMILY | | |
| Married, w/children | 23.53% | 30.42% |
| Married, no children | 37.10% | 42.46% |
| Single, w/children | 25.09% | 14.39% |
| Single, no children | 14.28% | 12.73% |
| Divorced | 16.00% | 10.62% |
| Separated | 4.74% | 4.97% |
| Widowed | 8.23% | 6.14% |
| Now Married | 40.09% | 46.32% |
| Never Married | 30.94% | 31.95% |
