| PEOPLE | Missoula | Leominster | United States |
| Population | 66,788 | 40,759 | 308,035,306 |
| Pop. Density | 2,428 | 1,415 | 87 |
| Pop. Change | 16.75% | -1.43% | 8.07% |
| Median Age | 31 | 40 | 37.3 |
| Households | 29,081 | 16,767 | 116,716,292 |
| Household Size | 2.18 | 2.41 | 2.58 |
| Male Population | 49.91% | 48.50% | 49.27% |
| Female Population | 50.09% | 51.50% | 50.96% |
| Married Population | 37.12% | 47.20% | 47.02% |
| Single Population | 62.88% | 52.80% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.73% | 5.93% | 6.56% |
| Age 5 to 9 | 4.99% | 6.10% | 6.61% |
| Age 10 to 14 | 4.34% | 6.54% | 6.71% |
| Age 15 to 17 | 2.83% | 4.20% | 4.21% |
| Age 18 to 20 | 4.74% | 2.42% | 2.95% |
| Age 21 to 24 | 15.03% | 5.79% | 7.01% |
| Age 25 to 34 | 18.72% | 12.42% | 13.33% |
| Age 35 to 44 | 10.87% | 13.84% | 13.33% |
| Age 45 to 49 | 11.52% | 16.40% | 14.61% |
| Age 50 to 54 | 11.52% | 16.40% | 14.61% |
| Age 55 to 59 | 10.57% | 12.16% | 11.84% |
| Age 60 to 64 | 10.57% | 12.16% | 11.84% |
| Age 65 to 74 | 5.24% | 6.87% | 7.05% |
| Age 75 to 84 | 3.46% | 4.83% | 4.24% |
| Age 85 and over | 1.95% | 2.50% | 1.78% |
| RACE | | | |
| White | 92.13% | 83.85% | 72.41% |
| Black | 0.53% | 5.05% | 12.61% |
| Asian | 1.21% | 2.76% | 4.75% |
| American Indian | 2.75% | 0.18% | 0.95% |
| Other | 3.38% | 8.16% | 9.28% |
| Hispanic | 16.78% | 1.13% | 16.35% |
| Non-Hispanic | 83.22% | 98.87% | 83.65% |
| FAMILY | | | |
| Married, w/children | 28.73% | 29.45% | 30.42% |
| Married, no children | 42.78% | 41.46% | 42.46% |
| Single, w/children | 17.46% | 16.12% | 14.39% |
| Single, no children | 11.03% | 12.97% | 12.73% |
| Divorced | 11.42% | 10.66% | 10.62% |
| Separated | 3.60% | 3.76% | 4.97% |
| Widowed | 4.39% | 5.95% | 6.14% |
| Now Married | 37.83% | 48.01% | 46.32% |
| Never Married | 42.75% | 31.62% | 31.95% |
