| | South New Castle, PA | Shelby, OH | United States |
| Population | 911 | 8,294 | 329,725,481 |
| Female Population | 42.9% | 54.6% | 50.5% |
| Male Population | 57.1% | 45.4% | 49.5% |
| Median Age | 36.1 | 41.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 713 | 9,307 | 309,327,143 |
| Population - 2000 | 808 | 9,821 | 285,036,114 |
| Population - 1990 | 805 | 9,564 | 251,960,433 |
| Pop. 2000 to Now | -18.4% | -7.7% | 15.6% |
| Pop. 1990 to Now | -18.1% | -5.2% | 30.8% |
| space4 | | | |
| Population Density | 2,811.7 | 1,316.1 | 93.4 |
| Land Area | 0.3 | 6.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | South New Castle, PA | Shelby, OH | United States |
| Age 0 to 4 | 5.5% | 5.7% | 5.9% |
| Age 5 to 9 | 6.6% | 7.4% | 6.1% |
| Age 10 to 14 | 10.6% | 6.9% | 6.6% |
| Age 15 to 17 | 2.7% | 5.0% | 3.9% |
| Age 18 to 20 | 2.5% | 2.8% | 4.0% |
| Age 21 to 24 | 11.0% | 3.4% | 5.2% |
| Age 25 to 34 | 9.8% | 10.6% | 13.8% |
| Age 35 to 44 | 6.5% | 12.5% | 12.9% |
| Age 45 to 54 | 8.8% | 10.6% | 12.6% |
| Age 55 to 59 | 6.9% | 9.1% | 6.7% |
| Age 60 to 64 | 14.5% | 6.5% | 6.3% |
| Age 65 to 74 | 8.6% | 9.2% | 9.6% |
| Age 75 to 84 | 3.0% | 6.5% | 4.5% |
| Age 85 and over | 3.1% | 3.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | South New Castle, PA | Shelby, OH | United States |
| White | 91.7% | 94.1% | 59.4% |
| Black | 0.3% | 0.4% | 12.2% |
| Asian | 0.3% | 2.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.2% | 0.0% | 0.4% |
| Two or More Races | 4.7% | 1.2% | 3.2% |
| Hispanic | 1.8% | 2.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | South New Castle, PA | Shelby, OH | United States |
| Married Population | 53.3% | 48.8% | 49.8% |
| Currently Married | 52.4% | 47.9% | 48.0% |
| Married but Separated | 0.9% | 0.9% | 1.8% |
| Single Population | 46.7% | 51.2% | 50.2% |
| Never Married | 31.0% | 24.5% | 33.8% |
| Divorced | 10.7% | 17.6% | 10.8% |
| Widowed | 5.1% | 9.1% | 5.6% |
| space5 | | | |
| Household Size | 2.79 | 2.27 | 2.60 |
| Households | 326 | 3,578 | 124,010,992 |
| Family Households | 249 | 2,006 | 80,755,759 |
| Married couple, w/children | 28.1% | 22.8% | 30.5% |
| Married couple, no children | 39.4% | 51.7% | 42.9% |
| Non Family Households | 77 | 1,572 | 43,255,233 |
| Single householder, w/children | 24.9% | 13.6% | 15.8% |
| Single householder, no children | 7.6% | 11.9% | 10.8% |