| | Yorba Linda, CA | Middleton, ID | United States |
| Population | 68,319 | 9,091 | 329,725,481 |
| Female Population | 51.0% | 47.5% | 50.5% |
| Male Population | 49.0% | 52.5% | 49.5% |
| Median Age | 44.3 | 31.3 | 38.4 |
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| Population - 2010 | 64,341 | 5,531 | 309,327,143 |
| Population - 2000 | 58,918 | 2,978 | 285,036,114 |
| Population - 1990 | 52,422 | 1,851 | 251,960,433 |
| Pop. 2000 to Now | 15.5% | 199.6% | 15.6% |
| Pop. 1990 to Now | 29.8% | 382.0% | 30.8% |
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| Population Density | 3,443.2 | 1,679.8 | 93.4 |
| Land Area | 19.8 | 5.4 | 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 | Middleton, ID | United States |
| Age 0 to 4 | 4.7% | 9.9% | 5.9% |
| Age 5 to 9 | 7.2% | 6.2% | 6.1% |
| Age 10 to 14 | 6.8% | 11.0% | 6.6% |
| Age 15 to 17 | 4.3% | 5.7% | 3.9% |
| Age 18 to 20 | 3.2% | 4.3% | 4.0% |
| Age 21 to 24 | 3.5% | 4.6% | 5.2% |
| Age 25 to 34 | 9.8% | 13.5% | 13.8% |
| Age 35 to 44 | 11.5% | 14.8% | 12.9% |
| Age 45 to 54 | 15.5% | 8.2% | 12.6% |
| Age 55 to 59 | 7.4% | 5.5% | 6.7% |
| Age 60 to 64 | 7.7% | 4.3% | 6.3% |
| Age 65 to 74 | 11.0% | 8.9% | 9.6% |
| Age 75 to 84 | 5.4% | 2.4% | 4.5% |
| Age 85 and over | 2.1% | 0.7% | 1.9% |
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| Race | | | |
| | Yorba Linda, CA | Middleton, ID | United States |
| White | 54.4% | 75.5% | 59.4% |
| Black | 1.2% | 0.1% | 12.2% |
| Asian | 21.9% | 1.3% | 5.6% |
| Native American | 0.2% | 0.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 3.6% | 5.5% | 3.2% |
| Hispanic | 18.1% | 16.7% | 18.4% |
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| Marriage & Family | | | |
| | Yorba Linda, CA | Middleton, ID | United States |
| Married Population | 62.5% | 56.6% | 49.8% |
| Currently Married | 61.8% | 53.9% | 48.0% |
| Married but Separated | 0.7% | 2.7% | 1.8% |
| Single Population | 37.5% | 43.4% | 50.2% |
| Never Married | 25.5% | 27.2% | 33.8% |
| Divorced | 7.4% | 12.6% | 10.8% |
| Widowed | 4.6% | 3.6% | 5.6% |
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| Household Size | 2.97 | 3.04 | 2.60 |
| Households | 22,920 | 2,993 | 124,010,992 |
| Family Households | 18,632 | 2,223 | 80,755,759 |
| Married couple, w/children | 35.7% | 40.9% | 30.5% |
| Married couple, no children | 49.8% | 36.3% | 42.9% |
| Non Family Households | 4,288 | 770 | 43,255,233 |
| Single householder, w/children | 6.9% | 18.4% | 15.8% |
| Single householder, no children | 7.6% | 4.4% | 10.8% |