| | Kapaa, HI | Solana Beach, CA | United States |
| Population | 11,516 | 13,025 | 329,725,481 |
| Female Population | 47.5% | 51.7% | 50.5% |
| Male Population | 52.5% | 48.4% | 49.5% |
| Median Age | 44.6 | 46.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 10,060 | 12,894 | 309,327,143 |
| Population - 2000 | 9,472 | 12,979 | 285,036,114 |
| Population - 1990 | 8,149 | 12,962 | 251,960,433 |
| Pop. 2000 to Now | 12.2% | 1.6% | 15.6% |
| Pop. 1990 to Now | 30.4% | 1.8% | 30.8% |
| space4 | | | |
| Population Density | 1,147.9 | 3,818.5 | 93.4 |
| Land Area | 10.0 | 3.4 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Kapaa, HI | Solana Beach, CA | United States |
| Age 0 to 4 | 4.9% | 4.9% | 5.9% |
| Age 5 to 9 | 7.5% | 6.8% | 6.1% |
| Age 10 to 14 | 3.7% | 6.3% | 6.6% |
| Age 15 to 17 | 2.6% | 3.0% | 3.9% |
| Age 18 to 20 | 1.2% | 1.9% | 4.0% |
| Age 21 to 24 | 3.4% | 2.6% | 5.2% |
| Age 25 to 34 | 10.3% | 9.0% | 13.8% |
| Age 35 to 44 | 17.0% | 13.7% | 12.9% |
| Age 45 to 54 | 16.7% | 14.1% | 12.6% |
| Age 55 to 59 | 5.5% | 9.6% | 6.7% |
| Age 60 to 64 | 7.5% | 6.3% | 6.3% |
| Age 65 to 74 | 11.5% | 12.1% | 9.6% |
| Age 75 to 84 | 6.3% | 7.9% | 4.5% |
| Age 85 and over | 1.9% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Kapaa, HI | Solana Beach, CA | United States |
| White | 34.7% | 68.4% | 59.4% |
| Black | 1.0% | 1.0% | 12.2% |
| Asian | 29.8% | 5.9% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 6.5% | 0.0% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 19.2% | 6.9% | 3.2% |
| Hispanic | 8.7% | 17.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Kapaa, HI | Solana Beach, CA | United States |
| Married Population | 47.5% | 57.6% | 49.8% |
| Currently Married | 47.3% | 56.6% | 48.0% |
| Married but Separated | 0.2% | 1.0% | 1.8% |
| Single Population | 52.5% | 42.4% | 50.2% |
| Never Married | 34.0% | 24.7% | 33.8% |
| Divorced | 13.1% | 12.2% | 10.8% |
| Widowed | 5.3% | 5.5% | 5.6% |
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| Household Size | 3.14 | 2.47 | 2.60 |
| Households | 3,638 | 5,278 | 124,010,992 |
| Family Households | 2,485 | 3,479 | 80,755,759 |
| Married couple, w/children | 14.9% | 29.3% | 30.5% |
| Married couple, no children | 53.1% | 53.7% | 42.9% |
| Non Family Households | 1,153 | 1,799 | 43,255,233 |
| Single householder, w/children | 18.1% | 11.7% | 15.8% |
| Single householder, no children | 13.8% | 5.3% | 10.8% |