| PEOPLE | St. Johnsville | Rochester | United States |
| Population | 1,732 | 29,752 | 308,035,306 |
| Pop. Density | 1,974 | 655 | 87 |
| Pop. Change | 2.10% | 3.50% | 8.07% |
| Median Age | 41.7 | 40.8 | 37.3 |
| Households | 691 | 12,378 | 116,716,292 |
| Household Size | 2.41 | 2.39 | 2.58 |
| Male Population | 46.19% | 48.32% | 49.27% |
| Female Population | 53.81% | 51.68% | 50.96% |
| Married Population | 45.10% | 51.69% | 47.02% |
| Single Population | 54.90% | 48.31% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.72% | 6.04% | 6.56% |
| Age 5 to 9 | 5.95% | 6.16% | 6.61% |
| Age 10 to 14 | 7.22% | 6.15% | 6.71% |
| Age 15 to 17 | 3.52% | 3.67% | 4.21% |
| Age 18 to 20 | 2.02% | 2.15% | 2.95% |
| Age 21 to 24 | 6.52% | 5.54% | 7.01% |
| Age 25 to 34 | 11.78% | 12.70% | 13.33% |
| Age 35 to 44 | 10.16% | 13.53% | 13.33% |
| Age 45 to 49 | 11.78% | 16.35% | 14.61% |
| Age 50 to 54 | 11.78% | 16.35% | 14.61% |
| Age 55 to 59 | 11.95% | 12.94% | 11.84% |
| Age 60 to 64 | 11.95% | 12.94% | 11.84% |
| Age 65 to 74 | 7.85% | 7.84% | 7.05% |
| Age 75 to 84 | 7.45% | 5.06% | 4.24% |
| Age 85 and over | 8.08% | 1.88% | 1.78% |
| RACE | | | |
| White | 97.69% | 95.42% | 72.41% |
| Black | 0.75% | 0.84% | 12.61% |
| Asian | 0.23% | 1.21% | 4.75% |
| American Indian | 0.23% | 0.31% | 0.95% |
| Other | 1.10% | 2.22% | 9.28% |
| Hispanic | 40.30% | 3.79% | 16.35% |
| Non-Hispanic | 59.70% | 96.21% | 83.65% |
| FAMILY | | | |
| Married, w/children | 22.60% | 26.37% | 30.42% |
| Married, no children | 43.00% | 46.56% | 42.46% |
| Single, w/children | 20.64% | 16.08% | 14.39% |
| Single, no children | 13.76% | 10.99% | 12.73% |
| Divorced | 9.10% | 11.92% | 10.62% |
| Separated | 6.82% | 1.94% | 4.97% |
| Widowed | 9.61% | 6.81% | 6.14% |
| Now Married | 45.12% | 51.87% | 46.32% |
| Never Married | 29.35% | 27.47% | 31.95% |
