| PEOPLE | Oak Ridge | Placentia | United States |
| Population | 29,330 | 50,533 | 308,035,306 |
| Pop. Density | 344 | 7,694 | 87 |
| Pop. Change | 5.49% | 7.67% | 8.07% |
| Median Age | 43.5 | 36 | 37.3 |
| Households | 12,772 | 16,365 | 116,716,292 |
| Household Size | 2.26 | 3.06 | 2.58 |
| Male Population | 47.19% | 49.23% | 49.27% |
| Female Population | 52.81% | 50.77% | 50.96% |
| Married Population | 50.21% | 50.47% | 47.02% |
| Single Population | 49.79% | 49.53% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.51% | 6.58% | 6.56% |
| Age 5 to 9 | 6.28% | 6.77% | 6.61% |
| Age 10 to 14 | 6.10% | 6.72% | 6.71% |
| Age 15 to 17 | 4.11% | 4.55% | 4.21% |
| Age 18 to 20 | 2.09% | 2.81% | 2.95% |
| Age 21 to 24 | 5.02% | 7.49% | 7.01% |
| Age 25 to 34 | 10.99% | 13.63% | 13.33% |
| Age 35 to 44 | 11.72% | 13.96% | 13.33% |
| Age 45 to 49 | 14.99% | 13.88% | 14.61% |
| Age 50 to 54 | 14.99% | 13.88% | 14.61% |
| Age 55 to 59 | 13.93% | 11.05% | 11.84% |
| Age 60 to 64 | 13.93% | 11.05% | 11.84% |
| Age 65 to 74 | 8.37% | 6.94% | 7.05% |
| Age 75 to 84 | 6.74% | 4.10% | 4.24% |
| Age 85 and over | 4.16% | 1.51% | 1.78% |
| RACE | | | |
| White | 83.94% | 62.08% | 72.41% |
| Black | 8.12% | 1.81% | 12.61% |
| Asian | 2.50% | 14.90% | 4.75% |
| American Indian | 0.37% | 0.76% | 0.95% |
| Other | 5.08% | 20.44% | 9.28% |
| Hispanic | 5.66% | 25.82% | 16.35% |
| Non-Hispanic | 94.34% | 74.18% | 83.65% |
| FAMILY | | | |
| Married, w/children | 25.62% | 35.18% | 30.42% |
| Married, no children | 47.30% | 40.83% | 42.46% |
| Single, w/children | 15.07% | 9.87% | 14.39% |
| Single, no children | 12.01% | 14.13% | 12.73% |
| Divorced | 14.35% | 8.29% | 10.62% |
| Separated | 3.23% | 5.39% | 4.97% |
| Widowed | 9.18% | 4.70% | 6.14% |
| Now Married | 50.98% | 49.90% | 46.32% |
| Never Married | 22.25% | 31.72% | 31.95% |
