| | Kittitas, WA | Ephrata, WA | United States |
| Population | 1,394 | 8,348 | 329,725,481 |
| Female Population | 47.9% | 44.9% | 50.5% |
| Male Population | 52.1% | 55.1% | 49.5% |
| Median Age | 32.1 | 34 | 38.4 |
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| Population - 2010 | 1,365 | 7,723 | 309,327,143 |
| Population - 2000 | 1,105 | 6,808 | 285,036,114 |
| Population - 1990 | 843 | 5,349 | 251,960,433 |
| Pop. 2000 to Now | 37.7% | 20.7% | 15.6% |
| Pop. 1990 to Now | 80.4% | 53.6% | 30.8% |
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| Population Density | 1,766.8 | 805.3 | 93.4 |
| Land Area | 0.8 | 10.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Kittitas, WA | Ephrata, WA | United States |
| Age 0 to 4 | 2.6% | 6.0% | 5.9% |
| Age 5 to 9 | 10.3% | 8.3% | 6.1% |
| Age 10 to 14 | 12.4% | 10.1% | 6.6% |
| Age 15 to 17 | 6.2% | 3.6% | 3.9% |
| Age 18 to 20 | 1.7% | 3.5% | 4.0% |
| Age 21 to 24 | 5.5% | 3.4% | 5.2% |
| Age 25 to 34 | 15.0% | 17.1% | 13.8% |
| Age 35 to 44 | 7.5% | 10.7% | 12.9% |
| Age 45 to 54 | 9.9% | 10.2% | 12.6% |
| Age 55 to 59 | 4.7% | 5.5% | 6.7% |
| Age 60 to 64 | 7.9% | 7.4% | 6.3% |
| Age 65 to 74 | 9.3% | 9.0% | 9.6% |
| Age 75 to 84 | 5.4% | 4.5% | 4.5% |
| Age 85 and over | 1.9% | 0.9% | 1.9% |
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| Race | | | |
| | Kittitas, WA | Ephrata, WA | United States |
| White | 70.7% | 66.4% | 59.4% |
| Black | 0.7% | 1.2% | 12.2% |
| Asian | 0.0% | 0.5% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 2.2% | 6.3% | 3.2% |
| Hispanic | 26.3% | 25.2% | 18.4% |
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| Marriage & Family | | | |
| | Kittitas, WA | Ephrata, WA | United States |
| Married Population | 52.7% | 48.2% | 49.8% |
| Currently Married | 49.3% | 44.6% | 48.0% |
| Married but Separated | 3.4% | 3.5% | 1.8% |
| Single Population | 47.3% | 51.8% | 50.2% |
| Never Married | 26.3% | 32.5% | 33.8% |
| Divorced | 15.5% | 11.4% | 10.8% |
| Widowed | 5.5% | 8.0% | 5.6% |
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| Household Size | 2.23 | 2.56 | 2.60 |
| Households | 626 | 3,185 | 124,010,992 |
| Family Households | 376 | 2,170 | 80,755,759 |
| Married couple, w/children | 22.6% | 23.4% | 30.5% |
| Married couple, no children | 40.2% | 41.2% | 42.9% |
| Non Family Households | 250 | 1,015 | 43,255,233 |
| Single householder, w/children | 27.4% | 32.7% | 15.8% |
| Single householder, no children | 9.8% | 2.6% | 10.8% |