| | Colfax, WA | Pomeroy, WA | United States |
| Population | 2,808 | 1,387 | 329,725,481 |
| Female Population | 49.9% | 50.8% | 50.5% |
| Male Population | 50.1% | 49.2% | 49.5% |
| Median Age | 46.5 | 49.1 | 38.4 |
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| Population - 2010 | 2,791 | 1,426 | 309,327,143 |
| Population - 2000 | 2,844 | 1,517 | 285,036,114 |
| Population - 1990 | 2,713 | 1,393 | 251,960,433 |
| Pop. 2000 to Now | -2.0% | -5.7% | 15.6% |
| Pop. 1990 to Now | 2.7% | 2.7% | 30.8% |
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| Population Density | 751.8 | 784.5 | 93.4 |
| Land Area | 3.7 | 1.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Colfax, WA | Pomeroy, WA | United States |
| Age 0 to 4 | 5.3% | 4.6% | 5.9% |
| Age 5 to 9 | 5.3% | 3.7% | 6.1% |
| Age 10 to 14 | 5.7% | 5.8% | 6.6% |
| Age 15 to 17 | 2.6% | 4.8% | 3.9% |
| Age 18 to 20 | 2.6% | 5.5% | 4.0% |
| Age 21 to 24 | 1.7% | 2.7% | 5.2% |
| Age 25 to 34 | 11.1% | 9.7% | 13.8% |
| Age 35 to 44 | 14.2% | 11.2% | 12.9% |
| Age 45 to 54 | 9.8% | 9.9% | 12.6% |
| Age 55 to 59 | 9.0% | 2.6% | 6.7% |
| Age 60 to 64 | 11.1% | 10.9% | 6.3% |
| Age 65 to 74 | 11.8% | 17.6% | 9.6% |
| Age 75 to 84 | 5.9% | 7.9% | 4.5% |
| Age 85 and over | 3.7% | 3.0% | 1.9% |
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| Race | | | |
| | Colfax, WA | Pomeroy, WA | United States |
| White | 86.9% | 90.8% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.5% | 1.9% | 5.6% |
| Native American | 1.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 3.0% | 0.0% | 0.4% |
| Two or More Races | 2.2% | 4.0% | 3.2% |
| Hispanic | 6.3% | 3.3% | 18.4% |
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| Marriage & Family | | | |
| | Colfax, WA | Pomeroy, WA | United States |
| Married Population | 44.3% | 61.6% | 49.8% |
| Currently Married | 43.7% | 59.9% | 48.0% |
| Married but Separated | 0.6% | 1.7% | 1.8% |
| Single Population | 55.7% | 38.4% | 50.2% |
| Never Married | 28.1% | 20.7% | 33.8% |
| Divorced | 17.7% | 11.7% | 10.8% |
| Widowed | 9.9% | 6.1% | 5.6% |
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| Household Size | 2.43 | 2.16 | 2.60 |
| Households | 1,120 | 634 | 124,010,992 |
| Family Households | 607 | 399 | 80,755,759 |
| Married couple, w/children | 29.7% | 30.3% | 30.5% |
| Married couple, no children | 47.3% | 56.1% | 42.9% |
| Non Family Households | 513 | 235 | 43,255,233 |
| Single householder, w/children | 8.4% | 6.5% | 15.8% |
| Single householder, no children | 14.7% | 7.0% | 10.8% |