| PEOPLE | South Plainfield | Florham Park | United States |
| Population | 23,385 | 11,696 | 308,035,306 |
| Pop. Density | 2,808 | 1,605 | 87 |
| Pop. Change | 7.59% | 31.50% | 8.07% |
| Median Age | 40.2 | 38 | 37.3 |
| Households | 7,876 | 4,003 | 116,716,292 |
| Household Size | 2.93 | 2.48 | 2.58 |
| Male Population | 48.55% | 45.53% | 49.27% |
| Female Population | 51.45% | 54.47% | 50.96% |
| Married Population | 55.81% | 58.67% | 47.02% |
| Single Population | 44.19% | 41.33% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.57% | 4.74% | 6.56% |
| Age 5 to 9 | 6.29% | 5.38% | 6.61% |
| Age 10 to 14 | 6.63% | 5.91% | 6.71% |
| Age 15 to 17 | 4.49% | 3.17% | 4.21% |
| Age 18 to 20 | 2.21% | 8.23% | 2.95% |
| Age 21 to 24 | 5.82% | 10.65% | 7.01% |
| Age 25 to 34 | 11.65% | 8.55% | 13.33% |
| Age 35 to 44 | 14.60% | 12.17% | 13.33% |
| Age 45 to 49 | 16.49% | 12.95% | 14.61% |
| Age 50 to 54 | 16.49% | 12.95% | 14.61% |
| Age 55 to 59 | 12.72% | 11.43% | 11.84% |
| Age 60 to 64 | 12.72% | 11.43% | 11.84% |
| Age 65 to 74 | 6.59% | 8.17% | 7.05% |
| Age 75 to 84 | 4.68% | 5.72% | 4.24% |
| Age 85 and over | 2.27% | 2.93% | 1.78% |
| RACE | | | |
| White | 66.74% | 86.35% | 72.41% |
| Black | 10.10% | 4.35% | 12.61% |
| Asian | 14.68% | 6.37% | 4.75% |
| American Indian | 0.37% | 0.07% | 0.95% |
| Other | 8.11% | 2.86% | 9.28% |
| Hispanic | 1.31% | 0.00% | 16.35% |
| Non-Hispanic | 98.69% | 100.00% | 83.65% |
| FAMILY | | | |
| Married, w/children | 36.72% | 35.69% | 30.42% |
| Married, no children | 42.52% | 48.48% | 42.46% |
| Single, w/children | 8.15% | 6.90% | 14.39% |
| Single, no children | 12.62% | 8.93% | 12.73% |
| Divorced | 6.55% | 6.39% | 10.62% |
| Separated | 3.90% | 2.18% | 4.97% |
| Widowed | 7.67% | 7.41% | 6.14% |
| Now Married | 54.90% | 58.07% | 46.32% |
| Never Married | 26.98% | 25.95% | 31.95% |
