| | Welch, TX | Fox Island, WA | United States |
| Population | 210 | 3,534 | 329,725,481 |
| Female Population | 53.3% | 49.3% | 50.5% |
| Male Population | 46.7% | 50.7% | 49.5% |
| Median Age | 25.8 | 48.3 | 38.4 |
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| Population - 2010 | 119 | 2,983 | 309,327,143 |
| Population - 2000 | 159 | 2,803 | 285,036,114 |
| Population - 1990 | 176 | 2,017 | 251,960,433 |
| Pop. 2000 to Now | 33.3% | 48.6% | 15.6% |
| Pop. 1990 to Now | 20.5% | 106.5% | 30.8% |
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| Population Density | 143.8 | 681.2 | 93.4 |
| Land Area | 1.5 | 5.2 | 3,531,905.4 |
| Water Area | 0.0 | 1.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Welch, TX | Fox Island, WA | United States |
| Age 0 to 4 | 21.4% | 4.6% | 5.9% |
| Age 5 to 9 | 6.2% | 4.6% | 6.1% |
| Age 10 to 14 | 2.9% | 6.5% | 6.6% |
| Age 15 to 17 | 8.6% | 3.5% | 3.9% |
| Age 18 to 20 | 5.2% | 2.9% | 4.0% |
| Age 21 to 24 | 3.8% | 2.8% | 5.2% |
| Age 25 to 34 | 6.2% | 8.2% | 13.8% |
| Age 35 to 44 | 7.1% | 11.8% | 12.9% |
| Age 45 to 54 | 9.0% | 16.2% | 12.6% |
| Age 55 to 59 | 5.7% | 5.3% | 6.7% |
| Age 60 to 64 | 8.6% | 9.5% | 6.3% |
| Age 65 to 74 | 9.0% | 14.5% | 9.6% |
| Age 75 to 84 | 6.2% | 8.4% | 4.5% |
| Age 85 and over | 0.0% | 1.1% | 1.9% |
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| Race | | | |
| | Welch, TX | Fox Island, WA | United States |
| White | 57.1% | 89.5% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 1.0% | 5.6% |
| Native American | 0.0% | 0.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 1.9% | 4.0% | 3.2% |
| Hispanic | 41.0% | 4.3% | 18.4% |
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| Marriage & Family | | | |
| | Welch, TX | Fox Island, WA | United States |
| Married Population | 67.1% | 68.6% | 49.8% |
| Currently Married | 65.8% | 67.4% | 48.0% |
| Married but Separated | 1.4% | 1.2% | 1.8% |
| Single Population | 32.9% | 31.4% | 50.2% |
| Never Married | 30.1% | 18.2% | 33.8% |
| Divorced | 1.4% | 8.0% | 10.8% |
| Widowed | 1.4% | 5.2% | 5.6% |
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| Household Size | 3.44 | 2.58 | 2.60 |
| Households | 61 | 1,371 | 124,010,992 |
| Family Households | 47 | 1,042 | 80,755,759 |
| Married couple, w/children | 57.4% | 35.0% | 30.5% |
| Married couple, no children | 42.6% | 58.9% | 42.9% |
| Non Family Households | 14 | 329 | 43,255,233 |
| Single householder, w/children | 0.0% | 0.7% | 15.8% |
| Single householder, no children | 0.0% | 5.4% | 10.8% |