| PEOPLE | Chelmsford | United States |
| Population | 33,802 | 308,035,306 |
| Pop. Density | 1,511 | 87 |
| Pop. Change | 0.04% | 8.07% |
| Median Age | 43.1 | 37.3 |
| Households | 13,313 | 116,716,292 |
| Household Size | 2.54 | 2.58 |
| Male Population | 48.42% | 49.27% |
| Female Population | 51.58% | 50.96% |
| Married Population | 57.42% | 47.02% |
| Single Population | 42.58% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | |
| Age 0 to 4 | 5.23% | 6.56% |
| Age 5 to 9 | 6.61% | 6.61% |
| Age 10 to 14 | 6.94% | 6.71% |
| Age 15 to 17 | 4.30% | 4.21% |
| Age 18 to 20 | 1.78% | 2.95% |
| Age 21 to 24 | 4.13% | 7.01% |
| Age 25 to 34 | 9.75% | 13.33% |
| Age 35 to 44 | 14.22% | 13.33% |
| Age 45 to 49 | 17.63% | 14.61% |
| Age 50 to 54 | 17.63% | 14.61% |
| Age 55 to 59 | 13.24% | 11.84% |
| Age 60 to 64 | 13.24% | 11.84% |
| Age 65 to 74 | 8.56% | 7.05% |
| Age 75 to 84 | 5.25% | 4.24% |
| Age 85 and over | 2.36% | 1.78% |
| RACE | | |
| White | 88.59% | 72.41% |
| Black | 1.06% | 12.61% |
| Asian | 8.42% | 4.75% |
| American Indian | 0.10% | 0.95% |
| Other | 1.83% | 9.28% |
| Hispanic | 2.38% | 16.35% |
| Non-Hispanic | 97.62% | 83.65% |
| FAMILY | | |
| Married, w/children | 37.00% | 30.42% |
| Married, no children | 46.23% | 42.46% |
| Single, w/children | 7.48% | 14.39% |
| Single, no children | 9.29% | 12.73% |
| Divorced | 8.58% | 10.62% |
| Separated | 2.46% | 4.97% |
| Widowed | 6.08% | 6.14% |
| Now Married | 57.70% | 46.32% |
| Never Married | 25.18% | 31.95% |
