| PEOPLE | Rocky Hill | Owings Mills | United States |
| Population | 19,709 | 30,622 | 308,035,306 |
| Pop. Density | 1,465 | 3,211 | 87 |
| Pop. Change | 9.84% | 50.05% | 8.07% |
| Median Age | 44 | 32.7 | 37.3 |
| Households | 8,307 | 12,525 | 116,716,292 |
| Household Size | 2.28 | 2.35 | 2.58 |
| Male Population | 48.79% | 44.94% | 49.27% |
| Female Population | 51.21% | 55.06% | 50.96% |
| Married Population | 46.28% | 39.72% | 47.02% |
| Single Population | 53.72% | 60.28% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 4.69% | 7.42% | 6.56% |
| Age 5 to 9 | 5.27% | 6.07% | 6.61% |
| Age 10 to 14 | 5.68% | 5.30% | 6.71% |
| Age 15 to 17 | 3.41% | 3.09% | 4.21% |
| Age 18 to 20 | 1.61% | 3.70% | 2.95% |
| Age 21 to 24 | 4.91% | 8.78% | 7.01% |
| Age 25 to 34 | 13.22% | 19.96% | 13.33% |
| Age 35 to 44 | 12.56% | 15.68% | 13.33% |
| Age 45 to 49 | 16.20% | 12.62% | 14.61% |
| Age 50 to 54 | 16.20% | 12.62% | 14.61% |
| Age 55 to 59 | 14.72% | 9.34% | 11.84% |
| Age 60 to 64 | 14.72% | 9.34% | 11.84% |
| Age 65 to 74 | 7.88% | 4.26% | 7.05% |
| Age 75 to 84 | 5.93% | 2.53% | 4.24% |
| Age 85 and over | 3.92% | 1.25% | 1.78% |
| RACE | | | |
| White | 83.11% | 34.26% | 72.41% |
| Black | 3.75% | 51.00% | 12.61% |
| Asian | 9.86% | 7.82% | 4.75% |
| American Indian | 0.22% | 0.30% | 0.95% |
| Other | 3.06% | 6.63% | 9.28% |
| Hispanic | 1.34% | 0.95% | 16.35% |
| Non-Hispanic | 98.66% | 99.05% | 83.65% |
| FAMILY | | | |
| Married, w/children | 32.87% | 29.88% | 30.42% |
| Married, no children | 47.90% | 34.78% | 42.46% |
| Single, w/children | 8.70% | 20.13% | 14.39% |
| Single, no children | 10.54% | 15.21% | 12.73% |
| Divorced | 11.80% | 10.40% | 10.62% |
| Separated | 4.28% | 5.41% | 4.97% |
| Widowed | 6.01% | 4.15% | 6.14% |
| Now Married | 46.92% | 40.42% | 46.32% |
| Never Married | 30.99% | 39.62% | 31.95% |
