| | Mount Joy, PA | Clearwater, FL | United States |
| Population | 8,251 | 116,616 | 329,725,481 |
| Female Population | 48.2% | 51.2% | 50.5% |
| Male Population | 51.8% | 48.8% | 49.5% |
| Median Age | 40.5 | 45.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,433 | 109,005 | 309,327,143 |
| Population - 2000 | 6,765 | 108,787 | 285,036,114 |
| Population - 1990 | 6,398 | 98,784 | 251,960,433 |
| Pop. 2000 to Now | 22.2% | 7.1% | 15.6% |
| Pop. 1990 to Now | 29.2% | 18.0% | 30.8% |
| space4 | | | |
| Population Density | 3,422.2 | 4,487.3 | 93.4 |
| Land Area | 2.4 | 26.0 | 3,531,905.4 |
| Water Area | 0.0 | 9.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mount Joy, PA | Clearwater, FL | United States |
| Age 0 to 4 | 5.5% | 4.8% | 5.9% |
| Age 5 to 9 | 7.3% | 4.8% | 6.1% |
| Age 10 to 14 | 9.6% | 5.3% | 6.6% |
| Age 15 to 17 | 0.9% | 3.0% | 3.9% |
| Age 18 to 20 | 1.7% | 2.5% | 4.0% |
| Age 21 to 24 | 2.5% | 3.9% | 5.2% |
| Age 25 to 34 | 14.8% | 12.7% | 13.8% |
| Age 35 to 44 | 16.1% | 11.9% | 12.9% |
| Age 45 to 54 | 11.0% | 13.4% | 12.6% |
| Age 55 to 59 | 7.1% | 8.1% | 6.7% |
| Age 60 to 64 | 5.1% | 6.7% | 6.3% |
| Age 65 to 74 | 9.7% | 12.9% | 9.6% |
| Age 75 to 84 | 5.9% | 6.1% | 4.5% |
| Age 85 and over | 2.8% | 4.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mount Joy, PA | Clearwater, FL | United States |
| White | 85.3% | 65.3% | 59.4% |
| Black | 2.0% | 11.9% | 12.2% |
| Asian | 0.6% | 3.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 1.8% | 2.3% | 3.2% |
| Hispanic | 10.3% | 17.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mount Joy, PA | Clearwater, FL | United States |
| Married Population | 60.4% | 45.3% | 49.8% |
| Currently Married | 56.0% | 43.7% | 48.0% |
| Married but Separated | 4.4% | 1.7% | 1.8% |
| Single Population | 39.6% | 54.7% | 50.2% |
| Never Married | 21.2% | 31.4% | 33.8% |
| Divorced | 10.3% | 15.1% | 10.8% |
| Widowed | 8.2% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 2.33 | 2.30 | 2.60 |
| Households | 3,536 | 49,574 | 124,010,992 |
| Family Households | 2,368 | 27,923 | 80,755,759 |
| Married couple, w/children | 23.5% | 20.7% | 30.5% |
| Married couple, no children | 47.2% | 50.4% | 42.9% |
| Non Family Households | 1,168 | 21,651 | 43,255,233 |
| Single householder, w/children | 17.4% | 16.3% | 15.8% |
| Single householder, no children | 12.0% | 12.5% | 10.8% |