| PEOPLE | Longmont | Arvada | United States |
| Population | 86,270 | 106,433 | 308,035,306 |
| Pop. Density | 3,294 | 3,029 | 87 |
| Pop. Change | 19.11% | 1.42% | 8.07% |
| Median Age | 36.6 | 40.5 | 37.3 |
| Households | 33,252 | 42,701 | 116,716,292 |
| Household Size | 2.57 | 2.48 | 2.58 |
| Male Population | 49.26% | 48.76% | 49.27% |
| Female Population | 50.74% | 51.24% | 50.96% |
| Married Population | 53.91% | 53.90% | 47.02% |
| Single Population | 46.09% | 46.10% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 7.20% | 5.88% | 6.56% |
| Age 5 to 9 | 7.67% | 6.48% | 6.61% |
| Age 10 to 14 | 7.15% | 6.77% | 6.71% |
| Age 15 to 17 | 4.17% | 4.23% | 4.21% |
| Age 18 to 20 | 2.26% | 2.27% | 2.95% |
| Age 21 to 24 | 5.64% | 5.48% | 7.01% |
| Age 25 to 34 | 13.52% | 11.84% | 13.33% |
| Age 35 to 44 | 14.68% | 13.37% | 13.33% |
| Age 45 to 49 | 15.30% | 16.37% | 14.61% |
| Age 50 to 54 | 15.30% | 16.37% | 14.61% |
| Age 55 to 59 | 11.24% | 13.42% | 11.84% |
| Age 60 to 64 | 11.24% | 13.42% | 11.84% |
| Age 65 to 74 | 6.02% | 7.57% | 7.05% |
| Age 75 to 84 | 3.52% | 4.60% | 4.24% |
| Age 85 and over | 1.63% | 1.73% | 1.78% |
| RACE | | | |
| White | 83.32% | 89.83% | 72.41% |
| Black | 0.94% | 0.90% | 12.61% |
| Asian | 3.20% | 2.17% | 4.75% |
| American Indian | 1.00% | 0.80% | 0.95% |
| Other | 11.55% | 6.29% | 9.28% |
| Hispanic | 5.50% | 5.93% | 16.35% |
| Non-Hispanic | 94.50% | 94.07% | 83.65% |
| FAMILY | | | |
| Married, w/children | 35.35% | 30.60% | 30.42% |
| Married, no children | 41.28% | 46.93% | 42.46% |
| Single, w/children | 14.13% | 12.19% | 14.39% |
| Single, no children | 9.24% | 10.27% | 12.73% |
| Divorced | 12.68% | 12.81% | 10.62% |
| Separated | 3.44% | 2.45% | 4.97% |
| Widowed | 4.65% | 5.82% | 6.14% |
| Now Married | 53.12% | 53.06% | 46.32% |
| Never Married | 26.11% | 25.86% | 31.95% |
