| | Encinitas, CA | Kailua (Honolulu County), HI | United States |
| Population | 62,140 | 40,402 | 329,725,481 |
| Female Population | 50.2% | 50.2% | 50.5% |
| Male Population | 49.8% | 49.8% | 49.5% |
| Median Age | 42.7 | 41.9 | 38.4 |
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| Population - 2010 | 59,638 | 38,541 | 309,327,143 |
| Population - 2000 | 58,014 | 36,513 | 285,036,114 |
| Population - 1990 | 55,386 | 36,818 | 251,960,433 |
| Pop. 2000 to Now | 8.0% | 1.4% | 15.6% |
| Pop. 1990 to Now | 13.2% | 0.5% | 30.8% |
| space4 | | | |
| Population Density | 3,273.6 | 5,202.4 | 93.4 |
| Land Area | 19.0 | 7.8 | 3,531,905.4 |
| Water Area | 1.2 | 2.8 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Encinitas, CA | Kailua (Honolulu County), HI | United States |
| Age 0 to 4 | 5.6% | 5.6% | 5.9% |
| Age 5 to 9 | 5.1% | 6.2% | 6.1% |
| Age 10 to 14 | 6.3% | 6.7% | 6.6% |
| Age 15 to 17 | 4.1% | 3.2% | 3.9% |
| Age 18 to 20 | 3.0% | 2.9% | 4.0% |
| Age 21 to 24 | 2.7% | 3.9% | 5.2% |
| Age 25 to 34 | 11.5% | 11.7% | 13.8% |
| Age 35 to 44 | 14.4% | 14.4% | 12.9% |
| Age 45 to 54 | 14.2% | 12.2% | 12.6% |
| Age 55 to 59 | 7.1% | 7.0% | 6.7% |
| Age 60 to 64 | 7.4% | 6.6% | 6.3% |
| Age 65 to 74 | 11.5% | 11.5% | 9.6% |
| Age 75 to 84 | 4.9% | 4.9% | 4.5% |
| Age 85 and over | 2.0% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Encinitas, CA | Kailua (Honolulu County), HI | United States |
| White | 74.9% | 41.4% | 59.4% |
| Black | 0.4% | 0.6% | 12.2% |
| Asian | 3.9% | 19.9% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 4.1% | 0.2% |
| Other | 0.1% | 0.9% | 0.4% |
| Two or More Races | 3.9% | 24.3% | 3.2% |
| Hispanic | 16.6% | 8.7% | 18.4% |
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| Marriage & Family | | | |
| | Encinitas, CA | Kailua (Honolulu County), HI | United States |
| Married Population | 56.3% | 57.1% | 49.8% |
| Currently Married | 55.4% | 56.4% | 48.0% |
| Married but Separated | 0.8% | 0.7% | 1.8% |
| Single Population | 43.7% | 42.9% | 50.2% |
| Never Married | 29.3% | 27.8% | 33.8% |
| Divorced | 10.1% | 8.9% | 10.8% |
| Widowed | 4.4% | 6.2% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 3.08 | 2.60 |
| Households | 23,746 | 13,039 | 124,010,992 |
| Family Households | 16,020 | 9,735 | 80,755,759 |
| Married couple, w/children | 35.8% | 32.9% | 30.5% |
| Married couple, no children | 48.2% | 46.4% | 42.9% |
| Non Family Households | 7,726 | 3,304 | 43,255,233 |
| Single householder, w/children | 8.4% | 8.2% | 15.8% |
| Single householder, no children | 7.6% | 12.5% | 10.8% |