| PEOPLE | Westfield | Costa Mesa | United States |
| Population | 41,094 | 109,960 | 308,035,306 |
| Pop. Density | 887 | 7,025 | 87 |
| Pop. Change | 1.21% | 0.82% | 8.07% |
| Median Age | 38.1 | 33.7 | 37.3 |
| Households | 15,335 | 39,946 | 116,716,292 |
| Household Size | 2.49 | 2.66 | 2.58 |
| Male Population | 48.89% | 50.90% | 49.27% |
| Female Population | 51.11% | 49.10% | 50.96% |
| Married Population | 44.02% | 36.92% | 47.02% |
| Single Population | 55.98% | 63.08% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.35% | 6.54% | 6.56% |
| Age 5 to 9 | 5.55% | 5.77% | 6.61% |
| Age 10 to 14 | 6.22% | 5.64% | 6.71% |
| Age 15 to 17 | 4.31% | 3.58% | 4.21% |
| Age 18 to 20 | 5.25% | 2.96% | 2.95% |
| Age 21 to 24 | 9.49% | 8.73% | 7.01% |
| Age 25 to 34 | 10.39% | 19.15% | 13.33% |
| Age 35 to 44 | 12.35% | 15.60% | 13.33% |
| Age 45 to 49 | 14.88% | 13.60% | 14.61% |
| Age 50 to 54 | 14.88% | 13.60% | 14.61% |
| Age 55 to 59 | 12.55% | 9.23% | 11.84% |
| Age 60 to 64 | 12.55% | 9.23% | 11.84% |
| Age 65 to 74 | 6.95% | 4.81% | 7.05% |
| Age 75 to 84 | 4.41% | 3.04% | 4.24% |
| Age 85 and over | 2.29% | 1.34% | 1.78% |
| RACE | | | |
| White | 92.77% | 68.51% | 72.41% |
| Black | 1.61% | 1.49% | 12.61% |
| Asian | 1.30% | 7.87% | 4.75% |
| American Indian | 0.25% | 0.62% | 0.95% |
| Other | 4.07% | 21.50% | 9.28% |
| Hispanic | 0.66% | 54.51% | 16.35% |
| Non-Hispanic | 99.34% | 45.49% | 83.65% |
| FAMILY | | | |
| Married, w/children | 30.54% | 34.29% | 30.42% |
| Married, no children | 44.68% | 36.62% | 42.46% |
| Single, w/children | 13.36% | 13.66% | 14.39% |
| Single, no children | 11.42% | 15.44% | 12.73% |
| Divorced | 9.10% | 11.55% | 10.62% |
| Separated | 4.21% | 7.68% | 4.97% |
| Widowed | 5.82% | 4.18% | 6.14% |
| Now Married | 43.99% | 36.47% | 46.32% |
| Never Married | 36.88% | 40.13% | 31.95% |
