| | Reisterstown, MD | Red Lion, PA | United States |
| Population | 27,917 | 6,478 | 329,725,481 |
| Female Population | 53.5% | 51.8% | 50.5% |
| Male Population | 46.6% | 48.2% | 49.5% |
| Median Age | 39.8 | 36.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 26,947 | 6,359 | 309,327,143 |
| Population - 2000 | 22,438 | 6,149 | 285,036,114 |
| Population - 1990 | 19,314 | 6,130 | 251,960,433 |
| Pop. 2000 to Now | 19.6% | 2.6% | 15.6% |
| Pop. 1990 to Now | 39.0% | 2.9% | 30.8% |
| space4 | | | |
| Population Density | 5,405.0 | 4,933.7 | 93.4 |
| Land Area | 5.2 | 1.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Reisterstown, MD | Red Lion, PA | United States |
| Age 0 to 4 | 4.8% | 5.9% | 5.9% |
| Age 5 to 9 | 7.9% | 5.9% | 6.1% |
| Age 10 to 14 | 6.9% | 6.5% | 6.6% |
| Age 15 to 17 | 3.7% | 1.0% | 3.9% |
| Age 18 to 20 | 3.5% | 2.9% | 4.0% |
| Age 21 to 24 | 5.5% | 3.8% | 5.2% |
| Age 25 to 34 | 12.4% | 19.9% | 13.8% |
| Age 35 to 44 | 13.2% | 12.0% | 12.9% |
| Age 45 to 54 | 14.4% | 10.8% | 12.6% |
| Age 55 to 59 | 7.5% | 10.1% | 6.7% |
| Age 60 to 64 | 6.0% | 6.1% | 6.3% |
| Age 65 to 74 | 8.6% | 6.8% | 9.6% |
| Age 75 to 84 | 3.8% | 4.6% | 4.5% |
| Age 85 and over | 1.9% | 3.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Reisterstown, MD | Red Lion, PA | United States |
| White | 43.5% | 87.6% | 59.4% |
| Black | 35.0% | 2.7% | 12.2% |
| Asian | 7.7% | 2.5% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 4.9% | 4.0% | 3.2% |
| Hispanic | 8.6% | 3.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Reisterstown, MD | Red Lion, PA | United States |
| Married Population | 48.5% | 39.0% | 49.8% |
| Currently Married | 45.6% | 38.0% | 48.0% |
| Married but Separated | 2.9% | 1.0% | 1.8% |
| Single Population | 51.5% | 61.0% | 50.2% |
| Never Married | 35.6% | 34.9% | 33.8% |
| Divorced | 10.1% | 16.7% | 10.8% |
| Widowed | 5.8% | 9.5% | 5.6% |
| space5 | | | |
| Household Size | 2.58 | 2.32 | 2.60 |
| Households | 10,721 | 2,787 | 124,010,992 |
| Family Households | 7,270 | 1,543 | 80,755,759 |
| Married couple, w/children | 31.5% | 23.6% | 30.5% |
| Married couple, no children | 35.4% | 35.0% | 42.9% |
| Non Family Households | 3,451 | 1,244 | 43,255,233 |
| Single householder, w/children | 17.2% | 22.7% | 15.8% |
| Single householder, no children | 15.8% | 18.7% | 10.8% |