| | Spring City, PA | Blythewood, SC | United States |
| Population | 3,465 | 4,543 | 329,725,481 |
| Female Population | 46.3% | 53.3% | 50.5% |
| Male Population | 53.7% | 46.7% | 49.5% |
| Median Age | 36.9 | 43.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,323 | 2,056 | 309,327,143 |
| Population - 2000 | 3,305 | 170 | 285,036,114 |
| Population - 1990 | 3,433 | 164 | 251,960,433 |
| Pop. 2000 to Now | -0.6% | 2,565.3% | 15.6% |
| Pop. 1990 to Now | -4.3% | 2,662.8% | 30.8% |
| space4 | | | |
| Population Density | 4,511.7 | 427.0 | 93.4 |
| Land Area | 0.8 | 10.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Spring City, PA | Blythewood, SC | United States |
| Age 0 to 4 | 5.0% | 4.8% | 5.9% |
| Age 5 to 9 | 4.0% | 8.0% | 6.1% |
| Age 10 to 14 | 2.7% | 8.9% | 6.6% |
| Age 15 to 17 | 3.5% | 3.9% | 3.9% |
| Age 18 to 20 | 1.8% | 1.7% | 4.0% |
| Age 21 to 24 | 4.4% | 3.5% | 5.2% |
| Age 25 to 34 | 26.4% | 9.9% | 13.8% |
| Age 35 to 44 | 7.9% | 11.8% | 12.9% |
| Age 45 to 54 | 11.8% | 15.9% | 12.6% |
| Age 55 to 59 | 7.9% | 11.3% | 6.7% |
| Age 60 to 64 | 12.6% | 7.8% | 6.3% |
| Age 65 to 74 | 7.0% | 7.1% | 9.6% |
| Age 75 to 84 | 4.0% | 1.3% | 4.5% |
| Age 85 and over | 1.0% | 4.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Spring City, PA | Blythewood, SC | United States |
| White | 81.2% | 49.2% | 59.4% |
| Black | 7.5% | 40.0% | 12.2% |
| Asian | 1.7% | 3.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.4% | 0.0% | 0.4% |
| Two or More Races | 1.6% | 0.2% | 3.2% |
| Hispanic | 6.7% | 7.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Spring City, PA | Blythewood, SC | United States |
| Married Population | 34.9% | 68.3% | 49.8% |
| Currently Married | 32.5% | 68.2% | 48.0% |
| Married but Separated | 2.4% | 0.2% | 1.8% |
| Single Population | 65.1% | 31.7% | 50.2% |
| Never Married | 40.8% | 22.7% | 33.8% |
| Divorced | 19.9% | 6.6% | 10.8% |
| Widowed | 4.4% | 2.3% | 5.6% |
| space5 | | | |
| Household Size | 1.74 | 2.68 | 2.60 |
| Households | 1,991 | 1,697 | 124,010,992 |
| Family Households | 708 | 1,212 | 80,755,759 |
| Married couple, w/children | 25.1% | 39.7% | 30.5% |
| Married couple, no children | 41.7% | 53.7% | 42.9% |
| Non Family Households | 1,283 | 485 | 43,255,233 |
| Single householder, w/children | 22.3% | 5.1% | 15.8% |
| Single householder, no children | 10.9% | 1.5% | 10.8% |