| | Yorba Linda, CA | Carefree, AZ | United States |
| Population | 68,319 | 3,642 | 329,725,481 |
| Female Population | 51.0% | 49.9% | 50.5% |
| Male Population | 49.0% | 50.1% | 49.5% |
| Median Age | 44.3 | 66.7 | 38.4 |
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| Population - 2010 | 64,341 | 3,369 | 309,327,143 |
| Population - 2000 | 58,918 | 2,927 | 285,036,114 |
| Population - 1990 | 52,422 | 1,666 | 251,960,433 |
| Pop. 2000 to Now | 15.5% | 35.8% | 15.6% |
| Pop. 1990 to Now | 29.8% | 138.5% | 30.8% |
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| Population Density | 3,443.2 | 413.5 | 93.4 |
| Land Area | 19.8 | 8.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Yorba Linda, CA | Carefree, AZ | United States |
| Age 0 to 4 | 4.7% | 0.0% | 5.9% |
| Age 5 to 9 | 7.2% | 0.0% | 6.1% |
| Age 10 to 14 | 6.8% | 0.0% | 6.6% |
| Age 15 to 17 | 4.3% | 1.9% | 3.9% |
| Age 18 to 20 | 3.2% | 3.3% | 4.0% |
| Age 21 to 24 | 3.5% | 1.3% | 5.2% |
| Age 25 to 34 | 9.8% | 2.6% | 13.8% |
| Age 35 to 44 | 11.5% | 1.7% | 12.9% |
| Age 45 to 54 | 15.5% | 14.6% | 12.6% |
| Age 55 to 59 | 7.4% | 10.5% | 6.7% |
| Age 60 to 64 | 7.7% | 9.3% | 6.3% |
| Age 65 to 74 | 11.0% | 23.0% | 9.6% |
| Age 75 to 84 | 5.4% | 26.2% | 4.5% |
| Age 85 and over | 2.1% | 5.6% | 1.9% |
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| Race | | | |
| | Yorba Linda, CA | Carefree, AZ | United States |
| White | 54.4% | 96.8% | 59.4% |
| Black | 1.2% | 1.1% | 12.2% |
| Asian | 21.9% | 0.7% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 3.6% | 0.1% | 3.2% |
| Hispanic | 18.1% | 1.3% | 18.4% |
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| Marriage & Family | | | |
| | Yorba Linda, CA | Carefree, AZ | United States |
| Married Population | 62.5% | 64.3% | 49.8% |
| Currently Married | 61.8% | 64.3% | 48.0% |
| Married but Separated | 0.7% | 0.0% | 1.8% |
| Single Population | 37.5% | 35.7% | 50.2% |
| Never Married | 25.5% | 11.7% | 33.8% |
| Divorced | 7.4% | 13.4% | 10.8% |
| Widowed | 4.6% | 10.6% | 5.6% |
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| Household Size | 2.97 | 1.95 | 2.60 |
| Households | 22,920 | 1,839 | 124,010,992 |
| Family Households | 18,632 | 1,225 | 80,755,759 |
| Married couple, w/children | 35.7% | 3.8% | 30.5% |
| Married couple, no children | 49.8% | 92.0% | 42.9% |
| Non Family Households | 4,288 | 614 | 43,255,233 |
| Single householder, w/children | 6.9% | 2.0% | 15.8% |
| Single householder, no children | 7.6% | 2.2% | 10.8% |