| PEOPLE | Fullerton | Fontana | United States |
| Population | 135,161 | 196,069 | 308,035,306 |
| Pop. Density | 6,047 | 4,621 | 87 |
| Pop. Change | 7.79% | 37.62% | 8.07% |
| Median Age | 34.8 | 28.7 | 37.3 |
| Households | 45,391 | 49,116 | 116,716,292 |
| Household Size | 2.9 | 4 | 2.58 |
| Male Population | 49.13% | 49.68% | 49.27% |
| Female Population | 50.87% | 50.32% | 50.96% |
| Married Population | 43.84% | 46.63% | 47.02% |
| Single Population | 56.16% | 53.37% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.90% | 8.58% | 6.56% |
| Age 5 to 9 | 6.30% | 8.78% | 6.61% |
| Age 10 to 14 | 6.74% | 9.45% | 6.71% |
| Age 15 to 17 | 4.41% | 6.10% | 4.21% |
| Age 18 to 20 | 3.92% | 3.79% | 2.95% |
| Age 21 to 24 | 9.05% | 7.93% | 7.01% |
| Age 25 to 34 | 13.97% | 14.47% | 13.33% |
| Age 35 to 44 | 13.97% | 14.93% | 13.33% |
| Age 45 to 49 | 14.31% | 12.71% | 14.61% |
| Age 50 to 54 | 14.31% | 12.71% | 14.61% |
| Age 55 to 59 | 9.71% | 7.60% | 11.84% |
| Age 60 to 64 | 9.71% | 7.60% | 11.84% |
| Age 65 to 74 | 5.82% | 3.44% | 7.05% |
| Age 75 to 84 | 4.00% | 1.70% | 4.24% |
| Age 85 and over | 1.91% | 0.52% | 1.78% |
| RACE | | | |
| White | 53.89% | 47.42% | 72.41% |
| Black | 2.32% | 9.98% | 12.61% |
| Asian | 22.78% | 6.60% | 4.75% |
| American Indian | 0.62% | 1.00% | 0.95% |
| Other | 20.38% | 34.99% | 9.28% |
| Hispanic | 85.62% | 37.71% | 16.35% |
| Non-Hispanic | 14.38% | 62.29% | 83.65% |
| FAMILY | | | |
| Married, w/children | 34.99% | 43.75% | 30.42% |
| Married, no children | 39.39% | 27.51% | 42.46% |
| Single, w/children | 11.17% | 15.69% | 14.39% |
| Single, no children | 14.46% | 13.05% | 12.73% |
| Divorced | 8.57% | 7.18% | 10.62% |
| Separated | 6.15% | 6.51% | 4.97% |
| Widowed | 5.64% | 3.19% | 6.14% |
| Now Married | 44.58% | 46.97% | 46.32% |
| Never Married | 35.06% | 36.15% | 31.95% |
