| | St. Clairsville, OH | Findlay, OH | United States |
| Population | 5,121 | 40,323 | 329,725,481 |
| Female Population | 49.8% | 51.8% | 50.5% |
| Male Population | 50.2% | 48.2% | 49.5% |
| Median Age | 49.4 | 37.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,197 | 41,127 | 309,327,143 |
| Population - 2000 | 5,057 | 38,967 | 285,036,114 |
| Population - 1990 | 5,162 | 35,703 | 251,960,433 |
| Pop. 2000 to Now | 0.6% | 4.8% | 15.6% |
| Pop. 1990 to Now | -1.5% | 14.4% | 30.8% |
| space4 | | | |
| Population Density | 2,117.9 | 2,056.7 | 93.4 |
| Land Area | 2.4 | 19.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Clairsville, OH | Findlay, OH | United States |
| Age 0 to 4 | 5.2% | 6.8% | 5.9% |
| Age 5 to 9 | 4.4% | 5.9% | 6.1% |
| Age 10 to 14 | 4.7% | 4.8% | 6.6% |
| Age 15 to 17 | 3.0% | 2.9% | 3.9% |
| Age 18 to 20 | 4.6% | 4.6% | 4.0% |
| Age 21 to 24 | 3.8% | 6.1% | 5.2% |
| Age 25 to 34 | 10.3% | 16.1% | 13.8% |
| Age 35 to 44 | 10.4% | 11.3% | 12.9% |
| Age 45 to 54 | 7.7% | 11.8% | 12.6% |
| Age 55 to 59 | 7.3% | 7.1% | 6.7% |
| Age 60 to 64 | 8.6% | 5.4% | 6.3% |
| Age 65 to 74 | 16.2% | 9.2% | 9.6% |
| Age 75 to 84 | 9.8% | 5.2% | 4.5% |
| Age 85 and over | 4.1% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Clairsville, OH | Findlay, OH | United States |
| White | 90.6% | 84.6% | 59.4% |
| Black | 2.5% | 2.4% | 12.2% |
| Asian | 0.5% | 2.3% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 4.4% | 2.6% | 3.2% |
| Hispanic | 2.0% | 7.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | St. Clairsville, OH | Findlay, OH | United States |
| Married Population | 54.9% | 42.7% | 49.8% |
| Currently Married | 51.0% | 40.5% | 48.0% |
| Married but Separated | 3.9% | 2.3% | 1.8% |
| Single Population | 45.1% | 57.3% | 50.2% |
| Never Married | 22.9% | 35.3% | 33.8% |
| Divorced | 12.9% | 14.7% | 10.8% |
| Widowed | 9.3% | 7.2% | 5.6% |
| space5 | | | |
| Household Size | 2.41 | 2.20 | 2.60 |
| Households | 2,041 | 17,550 | 124,010,992 |
| Family Households | 1,244 | 9,236 | 80,755,759 |
| Married couple, w/children | 22.7% | 27.4% | 30.5% |
| Married couple, no children | 59.3% | 41.3% | 42.9% |
| Non Family Households | 797 | 8,314 | 43,255,233 |
| Single householder, w/children | 9.0% | 21.0% | 15.8% |
| Single householder, no children | 8.9% | 10.3% | 10.8% |