| | Keedysville, MD | Lancaster, KY | United States |
| Population | 1,126 | 3,845 | 329,725,481 |
| Female Population | 46.1% | 56.4% | 50.5% |
| Male Population | 53.9% | 43.6% | 49.5% |
| Median Age | 38.4 | 36.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,153 | 3,792 | 309,327,143 |
| Population - 2000 | 482 | 3,734 | 285,036,114 |
| Population - 1990 | 464 | 3,421 | 251,960,433 |
| Pop. 2000 to Now | 153.1% | 2.8% | 15.6% |
| Pop. 1990 to Now | 162.9% | 12.3% | 30.8% |
| space4 | | | |
| Population Density | 1,241.5 | 1,758.1 | 93.4 |
| Land Area | 0.9 | 2.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Keedysville, MD | Lancaster, KY | United States |
| Age 0 to 4 | 6.0% | 7.0% | 5.9% |
| Age 5 to 9 | 5.1% | 7.2% | 6.1% |
| Age 10 to 14 | 10.5% | 7.8% | 6.6% |
| Age 15 to 17 | 7.5% | 3.8% | 3.9% |
| Age 18 to 20 | 3.3% | 4.2% | 4.0% |
| Age 21 to 24 | 6.0% | 2.5% | 5.2% |
| Age 25 to 34 | 5.8% | 16.3% | 13.8% |
| Age 35 to 44 | 16.4% | 11.1% | 12.9% |
| Age 45 to 54 | 18.5% | 13.7% | 12.6% |
| Age 55 to 59 | 4.3% | 5.2% | 6.7% |
| Age 60 to 64 | 7.6% | 4.7% | 6.3% |
| Age 65 to 74 | 7.0% | 5.7% | 9.6% |
| Age 75 to 84 | 1.5% | 7.5% | 4.5% |
| Age 85 and over | 0.5% | 3.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Keedysville, MD | Lancaster, KY | United States |
| White | 93.1% | 87.3% | 59.4% |
| Black | 0.5% | 9.2% | 12.2% |
| Asian | 0.8% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 4.9% | 1.4% | 3.2% |
| Hispanic | 0.7% | 1.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Keedysville, MD | Lancaster, KY | United States |
| Married Population | 65.1% | 49.5% | 49.8% |
| Currently Married | 63.5% | 44.2% | 48.0% |
| Married but Separated | 1.6% | 5.4% | 1.8% |
| Single Population | 34.9% | 50.5% | 50.2% |
| Never Married | 25.0% | 29.4% | 33.8% |
| Divorced | 7.1% | 13.1% | 10.8% |
| Widowed | 2.7% | 8.0% | 5.6% |
| space5 | | | |
| Household Size | 3.11 | 2.54 | 2.60 |
| Households | 362 | 1,479 | 124,010,992 |
| Family Households | 310 | 1,059 | 80,755,759 |
| Married couple, w/children | 46.8% | 20.8% | 30.5% |
| Married couple, no children | 37.1% | 30.5% | 42.9% |
| Non Family Households | 52 | 420 | 43,255,233 |
| Single householder, w/children | 12.3% | 34.4% | 15.8% |
| Single householder, no children | 3.9% | 14.4% | 10.8% |