| | Kapaa, HI | Ewa Beach, HI | United States |
| Population | 11,516 | 14,614 | 329,725,481 |
| Female Population | 47.5% | 49.3% | 50.5% |
| Male Population | 52.5% | 50.7% | 49.5% |
| Median Age | 44.6 | 39.1 | 38.4 |
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| Population - 2010 | 10,060 | 15,294 | 309,327,143 |
| Population - 2000 | 9,472 | 14,650 | 285,036,114 |
| Population - 1990 | 8,149 | 14,315 | 251,960,433 |
| Pop. 2000 to Now | 12.2% | -0.2% | 15.6% |
| Pop. 1990 to Now | 30.4% | 2.2% | 30.8% |
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| Population Density | 1,147.9 | 12,270.4 | 93.4 |
| Land Area | 10.0 | 1.2 | 3,531,905.4 |
| Water Area | 0.3 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Kapaa, HI | Ewa Beach, HI | United States |
| Age 0 to 4 | 4.9% | 4.7% | 5.9% |
| Age 5 to 9 | 7.5% | 4.3% | 6.1% |
| Age 10 to 14 | 3.7% | 6.5% | 6.6% |
| Age 15 to 17 | 2.6% | 4.1% | 3.9% |
| Age 18 to 20 | 1.2% | 2.7% | 4.0% |
| Age 21 to 24 | 3.4% | 5.9% | 5.2% |
| Age 25 to 34 | 10.3% | 15.3% | 13.8% |
| Age 35 to 44 | 17.0% | 14.3% | 12.9% |
| Age 45 to 54 | 16.7% | 11.2% | 12.6% |
| Age 55 to 59 | 5.5% | 7.6% | 6.7% |
| Age 60 to 64 | 7.5% | 6.8% | 6.3% |
| Age 65 to 74 | 11.5% | 9.2% | 9.6% |
| Age 75 to 84 | 6.3% | 4.8% | 4.5% |
| Age 85 and over | 1.9% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Kapaa, HI | Ewa Beach, HI | United States |
| White | 34.7% | 6.0% | 59.4% |
| Black | 1.0% | 0.0% | 12.2% |
| Asian | 29.8% | 50.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 6.5% | 9.7% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 19.2% | 19.5% | 3.2% |
| Hispanic | 8.7% | 14.0% | 18.4% |
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| Marriage & Family | | | |
| | Kapaa, HI | Ewa Beach, HI | United States |
| Married Population | 47.5% | 47.6% | 49.8% |
| Currently Married | 47.3% | 46.2% | 48.0% |
| Married but Separated | 0.2% | 1.4% | 1.8% |
| Single Population | 52.5% | 52.4% | 50.2% |
| Never Married | 34.0% | 38.8% | 33.8% |
| Divorced | 13.1% | 8.3% | 10.8% |
| Widowed | 5.3% | 5.3% | 5.6% |
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| Household Size | 3.14 | 4.55 | 2.60 |
| Households | 3,638 | 3,170 | 124,010,992 |
| Family Households | 2,485 | 2,799 | 80,755,759 |
| Married couple, w/children | 14.9% | 29.6% | 30.5% |
| Married couple, no children | 53.1% | 33.2% | 42.9% |
| Non Family Households | 1,153 | 371 | 43,255,233 |
| Single householder, w/children | 18.1% | 13.3% | 15.8% |
| Single householder, no children | 13.8% | 23.9% | 10.8% |