| | McKean, PA | Kilmarnock, VA | United States |
| Population | 504 | 1,424 | 329,725,481 |
| Female Population | 56.4% | 61.2% | 50.5% |
| Male Population | 43.7% | 38.8% | 49.5% |
| Median Age | 40.6 | 56 | 38.4 |
| space3 | | | |
| Population - 2010 | 390 | 1,487 | 309,327,143 |
| Population - 2000 | 389 | 1,244 | 285,036,114 |
| Population - 1990 | 418 | 1,109 | 251,960,433 |
| Pop. 2000 to Now | -5.9% | 12.5% | 15.6% |
| Pop. 1990 to Now | -12.4% | 26.2% | 30.8% |
| space4 | | | |
| Population Density | 881.1 | 417.8 | 93.4 |
| Land Area | 0.6 | 3.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | McKean, PA | Kilmarnock, VA | United States |
| Age 0 to 4 | 6.7% | 8.8% | 5.9% |
| Age 5 to 9 | 6.2% | 3.4% | 6.1% |
| Age 10 to 14 | 10.3% | 1.1% | 6.6% |
| Age 15 to 17 | 2.8% | 2.8% | 3.9% |
| Age 18 to 20 | 1.0% | 1.7% | 4.0% |
| Age 21 to 24 | 1.2% | 2.9% | 5.2% |
| Age 25 to 34 | 10.1% | 13.0% | 13.8% |
| Age 35 to 44 | 14.3% | 8.1% | 12.9% |
| Age 45 to 54 | 9.1% | 7.0% | 12.6% |
| Age 55 to 59 | 4.6% | 8.1% | 6.7% |
| Age 60 to 64 | 11.5% | 7.5% | 6.3% |
| Age 65 to 74 | 12.5% | 18.3% | 9.6% |
| Age 75 to 84 | 5.0% | 13.6% | 4.5% |
| Age 85 and over | 4.8% | 3.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | McKean, PA | Kilmarnock, VA | United States |
| White | 95.8% | 69.5% | 59.4% |
| Black | 3.0% | 25.4% | 12.2% |
| Asian | 0.0% | 3.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.2% | 1.2% | 3.2% |
| Hispanic | 0.0% | 0.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | McKean, PA | Kilmarnock, VA | United States |
| Married Population | 53.5% | 36.6% | 49.8% |
| Currently Married | 50.6% | 35.0% | 48.0% |
| Married but Separated | 2.8% | 1.6% | 1.8% |
| Single Population | 46.5% | 63.4% | 50.2% |
| Never Married | 21.4% | 30.9% | 33.8% |
| Divorced | 13.2% | 18.0% | 10.8% |
| Widowed | 11.9% | 14.5% | 5.6% |
| space5 | | | |
| Household Size | 2.17 | 1.91 | 2.60 |
| Households | 232 | 687 | 124,010,992 |
| Family Households | 121 | 307 | 80,755,759 |
| Married couple, w/children | 39.7% | 8.8% | 30.5% |
| Married couple, no children | 40.5% | 57.0% | 42.9% |
| Non Family Households | 111 | 380 | 43,255,233 |
| Single householder, w/children | 16.5% | 26.7% | 15.8% |
| Single householder, no children | 3.3% | 7.5% | 10.8% |