| PEOPLE | Buffalo | Westfield | United States |
| Population | 261,310 | 41,094 | 308,035,306 |
| Pop. Density | 6,471 | 887 | 87 |
| Pop. Change | -11.82% | 1.21% | 8.07% |
| Median Age | 33.4 | 38.1 | 37.3 |
| Households | 112,536 | 15,335 | 116,716,292 |
| Household Size | 2.24 | 2.49 | 2.58 |
| Male Population | 47.92% | 48.89% | 49.27% |
| Female Population | 52.08% | 51.11% | 50.96% |
| Married Population | 28.41% | 44.02% | 47.02% |
| Single Population | 71.59% | 55.98% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.66% | 5.35% | 6.56% |
| Age 5 to 9 | 6.27% | 5.55% | 6.61% |
| Age 10 to 14 | 6.38% | 6.22% | 6.71% |
| Age 15 to 17 | 4.26% | 4.31% | 4.21% |
| Age 18 to 20 | 3.93% | 5.25% | 2.95% |
| Age 21 to 24 | 9.97% | 9.49% | 7.01% |
| Age 25 to 34 | 14.56% | 10.39% | 13.33% |
| Age 35 to 44 | 11.68% | 12.35% | 13.33% |
| Age 45 to 49 | 14.00% | 14.88% | 14.61% |
| Age 50 to 54 | 14.00% | 14.88% | 14.61% |
| Age 55 to 59 | 10.89% | 12.55% | 11.84% |
| Age 60 to 64 | 10.89% | 12.55% | 11.84% |
| Age 65 to 74 | 5.91% | 6.95% | 7.05% |
| Age 75 to 84 | 3.90% | 4.41% | 4.24% |
| Age 85 and over | 1.60% | 2.29% | 1.78% |
| RACE | | | |
| White | 50.42% | 92.77% | 72.41% |
| Black | 38.56% | 1.61% | 12.61% |
| Asian | 3.22% | 1.30% | 4.75% |
| American Indian | 0.77% | 0.25% | 0.95% |
| Other | 7.03% | 4.07% | 9.28% |
| Hispanic | 1.33% | 0.66% | 16.35% |
| Non-Hispanic | 98.67% | 99.34% | 83.65% |
| FAMILY | | | |
| Married, w/children | 17.90% | 30.54% | 30.42% |
| Married, no children | 28.35% | 44.68% | 42.46% |
| Single, w/children | 30.73% | 13.36% | 14.39% |
| Single, no children | 23.03% | 11.42% | 12.73% |
| Divorced | 10.89% | 9.10% | 10.62% |
| Separated | 5.84% | 4.21% | 4.97% |
| Widowed | 7.96% | 5.82% | 6.14% |
| Now Married | 27.99% | 43.99% | 46.32% |
| Never Married | 47.33% | 36.88% | 31.95% |
