| | Mansfield, PA | Castalia, OH | United States |
| Population | 2,933 | 1,120 | 329,725,481 |
| Female Population | 53.9% | 40.2% | 50.5% |
| Male Population | 46.1% | 59.8% | 49.5% |
| Median Age | 31.9 | 28.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,632 | 851 | 309,327,143 |
| Population - 2000 | 3,411 | 935 | 285,036,114 |
| Population - 1990 | 3,538 | 915 | 251,960,433 |
| Pop. 2000 to Now | -12.9% | -13.4% | 15.6% |
| Pop. 1990 to Now | -16.0% | -11.5% | 30.8% |
| space4 | | | |
| Population Density | 1,556.8 | 1,072.8 | 93.4 |
| Land Area | 1.9 | 1.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mansfield, PA | Castalia, OH | United States |
| Age 0 to 4 | 3.3% | 3.4% | 5.9% |
| Age 5 to 9 | 8.7% | 21.4% | 6.1% |
| Age 10 to 14 | 4.5% | 2.5% | 6.6% |
| Age 15 to 17 | 2.6% | 4.1% | 3.9% |
| Age 18 to 20 | 7.6% | 5.2% | 4.0% |
| Age 21 to 24 | 12.4% | 7.9% | 5.2% |
| Age 25 to 34 | 15.3% | 12.1% | 13.8% |
| Age 35 to 44 | 7.0% | 8.9% | 12.9% |
| Age 45 to 54 | 8.5% | 13.1% | 12.6% |
| Age 55 to 59 | 7.6% | 7.7% | 6.7% |
| Age 60 to 64 | 4.8% | 3.1% | 6.3% |
| Age 65 to 74 | 11.6% | 5.9% | 9.6% |
| Age 75 to 84 | 4.2% | 2.5% | 4.5% |
| Age 85 and over | 1.9% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mansfield, PA | Castalia, OH | United States |
| White | 93.7% | 72.5% | 59.4% |
| Black | 3.9% | 0.6% | 12.2% |
| Asian | 0.2% | 1.2% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.9% | 23.4% | 3.2% |
| Hispanic | 1.3% | 1.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mansfield, PA | Castalia, OH | United States |
| Married Population | 43.1% | 45.0% | 49.8% |
| Currently Married | 41.0% | 44.5% | 48.0% |
| Married but Separated | 2.1% | 0.5% | 1.8% |
| Single Population | 56.9% | 55.0% | 50.2% |
| Never Married | 43.3% | 37.1% | 33.8% |
| Divorced | 7.6% | 12.9% | 10.8% |
| Widowed | 6.0% | 5.0% | 5.6% |
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| Household Size | 2.26 | 2.85 | 2.60 |
| Households | 1,257 | 393 | 124,010,992 |
| Family Households | 686 | 254 | 80,755,759 |
| Married couple, w/children | 23.5% | 40.9% | 30.5% |
| Married couple, no children | 42.4% | 33.5% | 42.9% |
| Non Family Households | 571 | 139 | 43,255,233 |
| Single householder, w/children | 23.9% | 15.0% | 15.8% |
| Single householder, no children | 10.2% | 10.6% | 10.8% |