| | Perinton, NY | Cockeysville, MD | United States |
| Population | 47,378 | 23,803 | 329,725,481 |
| Female Population | 52.2% | 49.7% | 50.5% |
| Male Population | 47.8% | 50.3% | 49.5% |
| Median Age | 46.1 | 34.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 46,474 | 19,842 | 309,327,143 |
| Population - 2000 | 46,090 | 19,388 | 285,036,114 |
| Population - 1990 | 43,015 | 18,668 | 251,960,433 |
| Pop. 2000 to Now | 1.4% | 7.0% | 15.6% |
| Pop. 1990 to Now | 8.7% | 11.1% | 30.8% |
| space4 | | | |
| Population Density | 1,385.8 | 2,090.4 | 93.4 |
| Land Area | 34.2 | 11.4 | 3,531,905.4 |
| Water Area | 0.4 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Perinton, NY | Cockeysville, MD | United States |
| Age 0 to 4 | 5.4% | 6.5% | 5.9% |
| Age 5 to 9 | 5.6% | 5.8% | 6.1% |
| Age 10 to 14 | 6.9% | 5.0% | 6.6% |
| Age 15 to 17 | 3.5% | 2.7% | 3.9% |
| Age 18 to 20 | 1.8% | 2.5% | 4.0% |
| Age 21 to 24 | 3.1% | 6.2% | 5.2% |
| Age 25 to 34 | 9.0% | 21.7% | 13.8% |
| Age 35 to 44 | 13.3% | 13.6% | 12.9% |
| Age 45 to 54 | 13.7% | 11.8% | 12.6% |
| Age 55 to 59 | 7.9% | 5.5% | 6.7% |
| Age 60 to 64 | 7.3% | 5.1% | 6.3% |
| Age 65 to 74 | 12.9% | 7.6% | 9.6% |
| Age 75 to 84 | 6.9% | 3.7% | 4.5% |
| Age 85 and over | 2.7% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Perinton, NY | Cockeysville, MD | United States |
| White | 88.7% | 54.8% | 59.4% |
| Black | 1.7% | 18.4% | 12.2% |
| Asian | 2.7% | 9.8% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.4% | 0.4% |
| Two or More Races | 2.5% | 4.5% | 3.2% |
| Hispanic | 4.2% | 11.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Perinton, NY | Cockeysville, MD | United States |
| Married Population | 61.1% | 45.4% | 49.8% |
| Currently Married | 60.3% | 43.0% | 48.0% |
| Married but Separated | 0.8% | 2.4% | 1.8% |
| Single Population | 38.9% | 54.6% | 50.2% |
| Never Married | 22.8% | 40.6% | 33.8% |
| Divorced | 9.6% | 9.6% | 10.8% |
| Widowed | 6.5% | 4.5% | 5.6% |
| space5 | | | |
| Household Size | 2.35 | 2.24 | 2.60 |
| Households | 19,980 | 10,384 | 124,010,992 |
| Family Households | 13,492 | 5,509 | 80,755,759 |
| Married couple, w/children | 30.2% | 27.4% | 30.5% |
| Married couple, no children | 53.8% | 42.7% | 42.9% |
| Non Family Households | 6,488 | 4,875 | 43,255,233 |
| Single householder, w/children | 9.5% | 17.6% | 15.8% |
| Single householder, no children | 6.4% | 12.3% | 10.8% |