| | Menifee, CA | Newport, OR | United States |
| Population | 101,089 | 10,305 | 329,725,481 |
| Female Population | 50.3% | 51.9% | 50.5% |
| Male Population | 49.7% | 48.1% | 49.5% |
| Median Age | 37.3 | 47.9 | 38.4 |
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| Population - 2010 | 78,115 | 10,018 | 309,327,143 |
| Population - 2000 | 42,516 | 9,532 | 285,036,114 |
| Population - 1990 | 29,354 | 8,437 | 251,960,433 |
| Pop. 2000 to Now | 129.7% | 16.8% | 15.6% |
| Pop. 1990 to Now | 232.8% | 31.9% | 30.8% |
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| Population Density | 2,175.3 | 1,151.8 | 93.4 |
| Land Area | 46.5 | 8.9 | 3,531,905.4 |
| Water Area | 0.2 | 1.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Menifee, CA | Newport, OR | United States |
| Age 0 to 4 | 6.9% | 4.1% | 5.9% |
| Age 5 to 9 | 7.4% | 4.5% | 6.1% |
| Age 10 to 14 | 7.1% | 4.4% | 6.6% |
| Age 15 to 17 | 4.0% | 3.6% | 3.9% |
| Age 18 to 20 | 2.8% | 3.3% | 4.0% |
| Age 21 to 24 | 4.2% | 5.0% | 5.2% |
| Age 25 to 34 | 14.8% | 10.0% | 13.8% |
| Age 35 to 44 | 12.2% | 12.1% | 12.9% |
| Age 45 to 54 | 10.9% | 10.9% | 12.6% |
| Age 55 to 59 | 6.1% | 7.0% | 6.7% |
| Age 60 to 64 | 6.3% | 7.7% | 6.3% |
| Age 65 to 74 | 8.8% | 17.1% | 9.6% |
| Age 75 to 84 | 6.1% | 7.6% | 4.5% |
| Age 85 and over | 2.4% | 3.0% | 1.9% |
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| Race | | | |
| | Menifee, CA | Newport, OR | United States |
| White | 43.6% | 76.6% | 59.4% |
| Black | 6.2% | 0.7% | 12.2% |
| Asian | 5.1% | 1.7% | 5.6% |
| Native American | 0.3% | 0.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.7% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 4.3% | 4.3% | 3.2% |
| Hispanic | 39.4% | 15.8% | 18.4% |
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| Marriage & Family | | | |
| | Menifee, CA | Newport, OR | United States |
| Married Population | 54.8% | 44.7% | 49.8% |
| Currently Married | 53.1% | 42.9% | 48.0% |
| Married but Separated | 1.7% | 1.9% | 1.8% |
| Single Population | 45.2% | 55.3% | 50.2% |
| Never Married | 27.3% | 31.1% | 33.8% |
| Divorced | 12.2% | 17.3% | 10.8% |
| Widowed | 5.6% | 6.9% | 5.6% |
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| Household Size | 3.12 | 2.20 | 2.60 |
| Households | 32,350 | 4,559 | 124,010,992 |
| Family Households | 24,389 | 2,421 | 80,755,759 |
| Married couple, w/children | 36.0% | 19.5% | 30.5% |
| Married couple, no children | 42.8% | 49.8% | 42.9% |
| Non Family Households | 7,961 | 2,138 | 43,255,233 |
| Single householder, w/children | 12.2% | 17.6% | 15.8% |
| Single householder, no children | 9.1% | 13.1% | 10.8% |