| PEOPLE | Billerica | Austin | United States |
| Population | 40,243 | 790,390 | 308,035,306 |
| Pop. Density | 1,574 | 2,653 | 87 |
| Pop. Change | 3.24% | 22.06% | 8.07% |
| Median Age | 40.1 | 31.1 | 37.3 |
| Households | 14,034 | 324,892 | 116,716,292 |
| Household Size | 2.79 | 2.38 | 2.58 |
| Male Population | 50.43% | 50.57% | 49.27% |
| Female Population | 49.57% | 49.43% | 50.96% |
| Married Population | 55.73% | 36.61% | 47.02% |
| Single Population | 44.27% | 63.39% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.51% | 7.34% | 6.56% |
| Age 5 to 9 | 6.07% | 6.38% | 6.61% |
| Age 10 to 14 | 6.98% | 5.40% | 6.71% |
| Age 15 to 17 | 4.65% | 3.09% | 4.21% |
| Age 18 to 20 | 2.13% | 3.43% | 2.95% |
| Age 21 to 24 | 5.56% | 11.06% | 7.01% |
| Age 25 to 34 | 12.00% | 20.71% | 13.33% |
| Age 35 to 44 | 15.25% | 14.77% | 13.33% |
| Age 45 to 49 | 17.55% | 12.06% | 14.61% |
| Age 50 to 54 | 17.55% | 12.06% | 14.61% |
| Age 55 to 59 | 12.13% | 8.73% | 11.84% |
| Age 60 to 64 | 12.13% | 8.73% | 11.84% |
| Age 65 to 74 | 7.51% | 3.92% | 7.05% |
| Age 75 to 84 | 3.49% | 2.17% | 4.24% |
| Age 85 and over | 1.18% | 0.96% | 1.78% |
| RACE | | | |
| White | 90.16% | 68.29% | 72.41% |
| Black | 2.11% | 8.15% | 12.61% |
| Asian | 5.45% | 6.31% | 4.75% |
| American Indian | 0.15% | 0.87% | 0.95% |
| Other | 2.13% | 16.38% | 9.28% |
| Hispanic | 0.00% | 2.01% | 16.35% |
| Non-Hispanic | 100.00% | 97.99% | 83.65% |
| FAMILY | | | |
| Married, w/children | 36.21% | 33.70% | 30.42% |
| Married, no children | 44.55% | 36.16% | 42.46% |
| Single, w/children | 7.53% | 16.33% | 14.39% |
| Single, no children | 11.71% | 13.81% | 12.73% |
| Divorced | 8.34% | 10.96% | 10.62% |
| Separated | 3.07% | 6.48% | 4.97% |
| Widowed | 4.81% | 3.42% | 6.14% |
| Now Married | 55.03% | 37.09% | 46.32% |
| Never Married | 28.76% | 42.05% | 31.95% |
