| | Southworth, WA | Parkwood, WA | United States |
| Population | 2,017 | 7,115 | 329,725,481 |
| Female Population | 50.1% | 49.0% | 50.5% |
| Male Population | 49.9% | 51.1% | 49.5% |
| Median Age | 51.8 | 39.5 | 38.4 |
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| Population - 2010 | 2,582 | 7,015 | 309,327,143 |
| Population - 2000 | 2,107 | 7,213 | 285,036,114 |
| Population - 1990 | 1,564 | 6,853 | 251,960,433 |
| Pop. 2000 to Now | 13.8% | -4.4% | 15.6% |
| Pop. 1990 to Now | 53.3% | 0.6% | 30.8% |
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| Population Density | 597.6 | 2,731.3 | 93.4 |
| Land Area | 3.4 | 2.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Southworth, WA | Parkwood, WA | United States |
| Age 0 to 4 | 3.8% | 4.8% | 5.9% |
| Age 5 to 9 | 3.3% | 5.7% | 6.1% |
| Age 10 to 14 | 3.0% | 8.8% | 6.6% |
| Age 15 to 17 | 3.2% | 2.5% | 3.9% |
| Age 18 to 20 | 2.2% | 2.2% | 4.0% |
| Age 21 to 24 | 3.5% | 4.6% | 5.2% |
| Age 25 to 34 | 7.7% | 14.0% | 13.8% |
| Age 35 to 44 | 10.8% | 16.2% | 12.9% |
| Age 45 to 54 | 21.7% | 10.1% | 12.6% |
| Age 55 to 59 | 8.2% | 6.9% | 6.7% |
| Age 60 to 64 | 8.4% | 8.3% | 6.3% |
| Age 65 to 74 | 14.3% | 8.8% | 9.6% |
| Age 75 to 84 | 8.9% | 6.5% | 4.5% |
| Age 85 and over | 1.2% | 0.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Southworth, WA | Parkwood, WA | United States |
| White | 90.0% | 68.0% | 59.4% |
| Black | 0.3% | 4.0% | 12.2% |
| Asian | 1.7% | 4.0% | 5.6% |
| Native American | 0.2% | 1.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 2.3% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 4.0% | 7.8% | 3.2% |
| Hispanic | 3.8% | 12.5% | 18.4% |
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| Marriage & Family | | | |
| | Southworth, WA | Parkwood, WA | United States |
| Married Population | 66.1% | 59.4% | 49.8% |
| Currently Married | 65.4% | 56.7% | 48.0% |
| Married but Separated | 0.7% | 2.6% | 1.8% |
| Single Population | 33.9% | 40.6% | 50.2% |
| Never Married | 17.7% | 23.5% | 33.8% |
| Divorced | 10.6% | 10.8% | 10.8% |
| Widowed | 5.6% | 6.4% | 5.6% |
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| Household Size | 2.21 | 2.49 | 2.60 |
| Households | 903 | 2,853 | 124,010,992 |
| Family Households | 674 | 1,888 | 80,755,759 |
| Married couple, w/children | 24.2% | 31.5% | 30.5% |
| Married couple, no children | 64.1% | 47.4% | 42.9% |
| Non Family Households | 229 | 965 | 43,255,233 |
| Single householder, w/children | 3.0% | 13.3% | 15.8% |
| Single householder, no children | 8.8% | 7.8% | 10.8% |