| | Adams township (Butler County), PA | Selah, WA | United States |
| Population | 14,438 | 8,081 | 329,725,481 |
| Female Population | 50.9% | 53.6% | 50.5% |
| Male Population | 49.1% | 46.4% | 49.5% |
| Median Age | 41.5 | 32.9 | 38.4 |
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| Population - 2010 | 11,680 | 7,359 | 309,327,143 |
| Population - 2000 | 6,774 | 6,310 | 285,036,114 |
| Population - 1990 | 3,911 | 5,113 | 251,960,433 |
| Pop. 2000 to Now | 106.4% | 29.0% | 15.6% |
| Pop. 1990 to Now | 257.5% | 59.2% | 30.8% |
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| Population Density | 644.5 | 1,763.6 | 93.4 |
| Land Area | 22.4 | 4.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Adams township (Butler County), PA | Selah, WA | United States |
| Age 0 to 4 | 5.8% | 7.7% | 5.9% |
| Age 5 to 9 | 9.4% | 7.9% | 6.1% |
| Age 10 to 14 | 8.0% | 6.9% | 6.6% |
| Age 15 to 17 | 4.1% | 4.2% | 3.9% |
| Age 18 to 20 | 2.7% | 5.5% | 4.0% |
| Age 21 to 24 | 2.1% | 4.7% | 5.2% |
| Age 25 to 34 | 8.6% | 15.8% | 13.8% |
| Age 35 to 44 | 16.0% | 12.1% | 12.9% |
| Age 45 to 54 | 14.6% | 11.6% | 12.6% |
| Age 55 to 59 | 6.7% | 6.3% | 6.7% |
| Age 60 to 64 | 7.5% | 5.8% | 6.3% |
| Age 65 to 74 | 10.1% | 6.8% | 9.6% |
| Age 75 to 84 | 2.7% | 3.1% | 4.5% |
| Age 85 and over | 1.8% | 1.7% | 1.9% |
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| Race | | | |
| | Adams township (Butler County), PA | Selah, WA | United States |
| White | 95.4% | 63.8% | 59.4% |
| Black | 0.5% | 1.6% | 12.2% |
| Asian | 2.7% | 1.4% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.7% | 0.2% | 0.4% |
| Two or More Races | 0.2% | 7.1% | 3.2% |
| Hispanic | 0.5% | 25.5% | 18.4% |
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| Marriage & Family | | | |
| | Adams township (Butler County), PA | Selah, WA | United States |
| Married Population | 70.2% | 53.9% | 49.8% |
| Currently Married | 69.3% | 53.4% | 48.0% |
| Married but Separated | 0.9% | 0.5% | 1.8% |
| Single Population | 29.8% | 46.1% | 50.2% |
| Never Married | 18.9% | 26.7% | 33.8% |
| Divorced | 7.3% | 15.3% | 10.8% |
| Widowed | 3.6% | 4.0% | 5.6% |
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| Household Size | 2.72 | 2.46 | 2.60 |
| Households | 5,302 | 3,222 | 124,010,992 |
| Family Households | 4,186 | 2,133 | 80,755,759 |
| Married couple, w/children | 40.2% | 31.9% | 30.5% |
| Married couple, no children | 48.2% | 44.8% | 42.9% |
| Non Family Households | 1,116 | 1,089 | 43,255,233 |
| Single householder, w/children | 7.4% | 16.3% | 15.8% |
| Single householder, no children | 4.2% | 7.0% | 10.8% |