| PEOPLE | Jefferson Township | Rockville | United States |
| Population | 21,314 | 61,209 | 308,035,306 |
| Pop. Density | 545 | 4,532 | 87 |
| Pop. Change | 8.07% | 32.00% | 8.07% |
| Median Age | 40.8 | 38.7 | 37.3 |
| Households | 7,830 | 23,686 | 116,716,292 |
| Household Size | 2.72 | 2.55 | 2.58 |
| Male Population | 50.11% | 47.93% | 49.27% |
| Female Population | 49.89% | 52.07% | 50.96% |
| Married Population | 60.65% | 48.58% | 47.02% |
| Single Population | 39.35% | 51.42% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.94% | 6.54% | 6.56% |
| Age 5 to 9 | 6.93% | 6.19% | 6.61% |
| Age 10 to 14 | 6.99% | 5.36% | 6.71% |
| Age 15 to 17 | 4.78% | 3.39% | 4.21% |
| Age 18 to 20 | 2.28% | 1.72% | 2.95% |
| Age 21 to 24 | 4.80% | 5.51% | 7.01% |
| Age 25 to 34 | 9.46% | 15.38% | 13.33% |
| Age 35 to 44 | 16.31% | 15.64% | 13.33% |
| Age 45 to 49 | 19.04% | 14.70% | 14.61% |
| Age 50 to 54 | 19.04% | 14.70% | 14.61% |
| Age 55 to 59 | 12.69% | 11.61% | 11.84% |
| Age 60 to 64 | 12.69% | 11.61% | 11.84% |
| Age 65 to 74 | 6.67% | 6.81% | 7.05% |
| Age 75 to 84 | 3.10% | 4.50% | 4.24% |
| Age 85 and over | 1.01% | 2.64% | 1.78% |
| RACE | | | |
| White | 90.64% | 60.40% | 72.41% |
| Black | 1.56% | 9.57% | 12.61% |
| Asian | 4.60% | 20.56% | 4.75% |
| American Indian | 0.08% | 0.33% | 0.95% |
| Other | 3.12% | 9.13% | 9.28% |
| Hispanic | 3.23% | 0.96% | 16.35% |
| Non-Hispanic | 96.77% | 99.04% | 83.65% |
| FAMILY | | | |
| Married, w/children | 40.58% | 36.39% | 30.42% |
| Married, no children | 43.27% | 43.38% | 42.46% |
| Single, w/children | 7.54% | 9.29% | 14.39% |
| Single, no children | 8.61% | 10.94% | 12.73% |
| Divorced | 9.89% | 9.04% | 10.62% |
| Separated | 1.90% | 6.82% | 4.97% |
| Widowed | 4.88% | 5.92% | 6.14% |
| Now Married | 59.92% | 47.85% | 46.32% |
| Never Married | 23.41% | 30.38% | 31.95% |
