| | Compton, CA | Hemet, CA | United States |
| Population | 96,083 | 88,903 | 329,725,481 |
| Female Population | 51.6% | 50.9% | 50.5% |
| Male Population | 48.5% | 49.1% | 49.5% |
| Median Age | 33.1 | 38.6 | 38.4 |
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| Population - 2010 | 96,428 | 79,105 | 309,327,143 |
| Population - 2000 | 93,493 | 58,812 | 285,036,114 |
| Population - 1990 | 90,454 | 36,094 | 251,960,433 |
| Pop. 2000 to Now | 0.5% | 44.8% | 15.6% |
| Pop. 1990 to Now | 3.9% | 135.9% | 30.8% |
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| Population Density | 9,581.5 | 3,037.8 | 93.4 |
| Land Area | 10.0 | 29.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Compton, CA | Hemet, CA | United States |
| Age 0 to 4 | 7.3% | 5.7% | 5.9% |
| Age 5 to 9 | 7.6% | 7.4% | 6.1% |
| Age 10 to 14 | 8.7% | 7.4% | 6.6% |
| Age 15 to 17 | 4.6% | 5.1% | 3.9% |
| Age 18 to 20 | 4.6% | 3.6% | 4.0% |
| Age 21 to 24 | 5.5% | 4.3% | 5.2% |
| Age 25 to 34 | 14.0% | 12.6% | 13.8% |
| Age 35 to 44 | 13.9% | 11.3% | 12.9% |
| Age 45 to 54 | 12.9% | 9.9% | 12.6% |
| Age 55 to 59 | 6.2% | 5.5% | 6.7% |
| Age 60 to 64 | 5.2% | 6.1% | 6.3% |
| Age 65 to 74 | 5.5% | 11.1% | 9.6% |
| Age 75 to 84 | 3.0% | 6.7% | 4.5% |
| Age 85 and over | 1.2% | 3.3% | 1.9% |
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| Race | | | |
| | Compton, CA | Hemet, CA | United States |
| White | 1.0% | 37.0% | 59.4% |
| Black | 26.7% | 8.0% | 12.2% |
| Asian | 0.9% | 2.3% | 5.6% |
| Native American | 0.1% | 0.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 1.0% | 0.1% | 0.4% |
| Two or More Races | 0.9% | 2.4% | 3.2% |
| Hispanic | 69.3% | 49.3% | 18.4% |
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| Marriage & Family | | | |
| | Compton, CA | Hemet, CA | United States |
| Married Population | 41.6% | 48.1% | 49.8% |
| Currently Married | 38.7% | 45.9% | 48.0% |
| Married but Separated | 2.9% | 2.2% | 1.8% |
| Single Population | 58.4% | 51.9% | 50.2% |
| Never Married | 46.6% | 29.7% | 33.8% |
| Divorced | 7.0% | 13.9% | 10.8% |
| Widowed | 4.8% | 8.3% | 5.6% |
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| Household Size | 3.83 | 2.91 | 2.60 |
| Households | 24,921 | 30,322 | 124,010,992 |
| Family Households | 20,084 | 20,531 | 80,755,759 |
| Married couple, w/children | 32.8% | 32.7% | 30.5% |
| Married couple, no children | 22.0% | 36.0% | 42.9% |
| Non Family Households | 4,837 | 9,791 | 43,255,233 |
| Single householder, w/children | 24.8% | 16.1% | 15.8% |
| Single householder, no children | 20.3% | 15.2% | 10.8% |