| | Boiling Springs, NC | Portland, TN | United States |
| Population | 4,511 | 13,031 | 329,725,481 |
| Female Population | 53.9% | 49.9% | 50.5% |
| Male Population | 46.1% | 50.2% | 49.5% |
| Median Age | 22.1 | 33.3 | 38.4 |
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| Population - 2010 | 4,645 | 11,530 | 309,327,143 |
| Population - 2000 | 3,866 | 8,458 | 285,036,114 |
| Population - 1990 | 2,445 | 5,165 | 251,960,433 |
| Pop. 2000 to Now | 19.4% | 57.3% | 15.6% |
| Pop. 1990 to Now | 88.8% | 157.5% | 30.8% |
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| Population Density | 1,006.7 | 977.1 | 93.4 |
| Land Area | 4.5 | 13.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Boiling Springs, NC | Portland, TN | United States |
| Age 0 to 4 | 8.8% | 6.8% | 5.9% |
| Age 5 to 9 | 3.4% | 7.5% | 6.1% |
| Age 10 to 14 | 6.2% | 6.5% | 6.6% |
| Age 15 to 17 | 4.1% | 6.5% | 3.9% |
| Age 18 to 20 | 21.8% | 5.4% | 4.0% |
| Age 21 to 24 | 10.4% | 5.6% | 5.2% |
| Age 25 to 34 | 7.0% | 14.2% | 13.8% |
| Age 35 to 44 | 8.5% | 14.0% | 12.9% |
| Age 45 to 54 | 11.1% | 12.9% | 12.6% |
| Age 55 to 59 | 4.1% | 4.9% | 6.7% |
| Age 60 to 64 | 3.1% | 5.8% | 6.3% |
| Age 65 to 74 | 4.4% | 7.2% | 9.6% |
| Age 75 to 84 | 4.7% | 1.9% | 4.5% |
| Age 85 and over | 2.4% | 0.8% | 1.9% |
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| Race | | | |
| | Boiling Springs, NC | Portland, TN | United States |
| White | 83.2% | 86.9% | 59.4% |
| Black | 7.1% | 2.1% | 12.2% |
| Asian | 1.8% | 0.2% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.6% | 1.3% | 3.2% |
| Hispanic | 6.3% | 9.1% | 18.4% |
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| Marriage & Family | | | |
| | Boiling Springs, NC | Portland, TN | United States |
| Married Population | 42.8% | 49.5% | 49.8% |
| Currently Married | 41.6% | 46.4% | 48.0% |
| Married but Separated | 1.3% | 3.2% | 1.8% |
| Single Population | 57.2% | 50.5% | 50.2% |
| Never Married | 48.8% | 31.0% | 33.8% |
| Divorced | 3.9% | 15.1% | 10.8% |
| Widowed | 4.4% | 4.4% | 5.6% |
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| Household Size | 3.02 | 2.77 | 2.60 |
| Households | 1,101 | 4,688 | 124,010,992 |
| Family Households | 879 | 3,330 | 80,755,759 |
| Married couple, w/children | 32.1% | 38.2% | 30.5% |
| Married couple, no children | 47.2% | 30.9% | 42.9% |
| Non Family Households | 222 | 1,358 | 43,255,233 |
| Single householder, w/children | 14.9% | 22.8% | 15.8% |
| Single householder, no children | 5.8% | 8.1% | 10.8% |