| | Kekaha, HI | Kapaa, HI | United States |
| Population | 3,014 | 11,516 | 329,725,481 |
| Female Population | 50.2% | 47.5% | 50.5% |
| Male Population | 49.8% | 52.5% | 49.5% |
| Median Age | 39.9 | 44.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,177 | 10,060 | 309,327,143 |
| Population - 2000 | 3,175 | 9,472 | 285,036,114 |
| Population - 1990 | 3,506 | 8,149 | 251,960,433 |
| Pop. 2000 to Now | 3.3% | 12.2% | 15.6% |
| Pop. 1990 to Now | -6.5% | 30.4% | 30.8% |
| space4 | | | |
| Population Density | 3,005.0 | 1,147.9 | 93.4 |
| Land Area | 1.0 | 10.0 | 3,531,905.4 |
| Water Area | 0.3 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Kekaha, HI | Kapaa, HI | United States |
| Age 0 to 4 | 4.5% | 4.9% | 5.9% |
| Age 5 to 9 | 8.1% | 7.5% | 6.1% |
| Age 10 to 14 | 10.6% | 3.7% | 6.6% |
| Age 15 to 17 | 1.3% | 2.6% | 3.9% |
| Age 18 to 20 | 3.8% | 1.2% | 4.0% |
| Age 21 to 24 | 5.3% | 3.4% | 5.2% |
| Age 25 to 34 | 10.8% | 10.3% | 13.8% |
| Age 35 to 44 | 10.4% | 17.0% | 12.9% |
| Age 45 to 54 | 11.3% | 16.7% | 12.6% |
| Age 55 to 59 | 7.1% | 5.5% | 6.7% |
| Age 60 to 64 | 6.3% | 7.5% | 6.3% |
| Age 65 to 74 | 12.2% | 11.5% | 9.6% |
| Age 75 to 84 | 5.7% | 6.3% | 4.5% |
| Age 85 and over | 2.3% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Kekaha, HI | Kapaa, HI | United States |
| White | 8.5% | 34.7% | 59.4% |
| Black | 0.0% | 1.0% | 12.2% |
| Asian | 15.3% | 29.8% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 27.4% | 6.5% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 33.3% | 19.2% | 3.2% |
| Hispanic | 15.5% | 8.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Kekaha, HI | Kapaa, HI | United States |
| Married Population | 50.7% | 47.5% | 49.8% |
| Currently Married | 49.0% | 47.3% | 48.0% |
| Married but Separated | 1.7% | 0.2% | 1.8% |
| Single Population | 49.3% | 52.5% | 50.2% |
| Never Married | 39.7% | 34.0% | 33.8% |
| Divorced | 5.1% | 13.1% | 10.8% |
| Widowed | 4.5% | 5.3% | 5.6% |
| space5 | | | |
| Household Size | 3.17 | 3.14 | 2.60 |
| Households | 947 | 3,638 | 124,010,992 |
| Family Households | 755 | 2,485 | 80,755,759 |
| Married couple, w/children | 15.1% | 14.9% | 30.5% |
| Married couple, no children | 43.2% | 53.1% | 42.9% |
| Non Family Households | 192 | 1,153 | 43,255,233 |
| Single householder, w/children | 26.6% | 18.1% | 15.8% |
| Single householder, no children | 15.1% | 13.8% | 10.8% |