| PEOPLE | Westfield | United States |
| Population | 30,068 | 308,035,306 |
| Pop. Density | 1,120 | 87 |
| Pop. Change | 92.73% | 8.07% |
| Median Age | 33.7 | 37.3 |
| Households | 10,490 | 116,716,292 |
| Household Size | 2.79 | 2.58 |
| Male Population | 48.91% | 49.27% |
| Female Population | 51.09% | 50.96% |
| Married Population | 53.93% | 47.02% |
| Single Population | 46.07% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | |
| Age 0 to 4 | 8.83% | 6.56% |
| Age 5 to 9 | 9.55% | 6.61% |
| Age 10 to 14 | 8.77% | 6.71% |
| Age 15 to 17 | 4.73% | 4.21% |
| Age 18 to 20 | 1.97% | 2.95% |
| Age 21 to 24 | 4.01% | 7.01% |
| Age 25 to 34 | 14.21% | 13.33% |
| Age 35 to 44 | 17.43% | 13.33% |
| Age 45 to 49 | 14.80% | 14.61% |
| Age 50 to 54 | 14.80% | 14.61% |
| Age 55 to 59 | 8.91% | 11.84% |
| Age 60 to 64 | 8.91% | 11.84% |
| Age 65 to 74 | 4.05% | 7.05% |
| Age 75 to 84 | 1.96% | 4.24% |
| Age 85 and over | 0.80% | 1.78% |
| RACE | | |
| White | 90.86% | 72.41% |
| Black | 2.19% | 12.61% |
| Asian | 2.45% | 4.75% |
| American Indian | 0.23% | 0.95% |
| Other | 4.27% | 9.28% |
| Hispanic | 4.02% | 16.35% |
| Non-Hispanic | 95.98% | 83.65% |
| FAMILY | | |
| Married, w/children | 47.39% | 30.42% |
| Married, no children | 36.24% | 42.46% |
| Single, w/children | 10.75% | 14.39% |
| Single, no children | 5.62% | 12.73% |
| Divorced | 11.20% | 10.62% |
| Separated | 2.08% | 4.97% |
| Widowed | 5.28% | 6.14% |
| Now Married | 54.85% | 46.32% |
| Never Married | 26.59% | 31.95% |
