| PEOPLE | Casper | Springfield | United States |
| Population | 55,316 | 153,060 | 308,035,306 |
| Pop. Density | 2,056 | 4,803 | 87 |
| Pop. Change | 12.10% | 0.68% | 8.07% |
| Median Age | 36.1 | 32.3 | 37.3 |
| Households | 22,794 | 56,752 | 116,716,292 |
| Household Size | 2.37 | 2.6 | 2.58 |
| Male Population | 49.75% | 47.41% | 49.27% |
| Female Population | 50.25% | 52.59% | 50.96% |
| Married Population | 50.49% | 31.12% | 47.02% |
| Single Population | 49.51% | 68.88% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 7.24% | 7.31% | 6.56% |
| Age 5 to 9 | 6.47% | 7.25% | 6.61% |
| Age 10 to 14 | 6.27% | 7.47% | 6.71% |
| Age 15 to 17 | 3.92% | 4.98% | 4.21% |
| Age 18 to 20 | 2.94% | 4.29% | 2.95% |
| Age 21 to 24 | 7.17% | 8.79% | 7.01% |
| Age 25 to 34 | 14.68% | 13.35% | 13.33% |
| Age 35 to 44 | 11.99% | 12.40% | 13.33% |
| Age 45 to 49 | 14.48% | 12.88% | 14.61% |
| Age 50 to 54 | 14.48% | 12.88% | 14.61% |
| Age 55 to 59 | 11.97% | 10.33% | 11.84% |
| Age 60 to 64 | 11.97% | 10.33% | 11.84% |
| Age 65 to 74 | 6.11% | 5.57% | 7.05% |
| Age 75 to 84 | 4.72% | 3.71% | 4.24% |
| Age 85 and over | 2.03% | 1.67% | 1.78% |
| RACE | | | |
| White | 92.28% | 51.83% | 72.41% |
| Black | 1.01% | 22.26% | 12.61% |
| Asian | 0.79% | 2.44% | 4.75% |
| American Indian | 0.94% | 0.64% | 0.95% |
| Other | 4.97% | 22.83% | 9.28% |
| Hispanic | 4.90% | 2.61% | 16.35% |
| Non-Hispanic | 95.10% | 97.39% | 83.65% |
| FAMILY | | | |
| Married, w/children | 29.54% | 19.00% | 30.42% |
| Married, no children | 44.27% | 28.77% | 42.46% |
| Single, w/children | 16.18% | 31.36% | 14.39% |
| Single, no children | 10.01% | 20.88% | 12.73% |
| Divorced | 13.12% | 10.41% | 10.62% |
| Separated | 3.49% | 7.35% | 4.97% |
| Widowed | 6.72% | 6.21% | 6.14% |
| Now Married | 49.55% | 31.26% | 46.32% |
| Never Married | 27.11% | 44.78% | 31.95% |
