| | El Cerrito CDP (Riverside County), CA | Fairfield, CA | United States |
| Population | 5,093 | 118,932 | 329,725,481 |
| Female Population | 51.5% | 50.1% | 50.5% |
| Male Population | 48.5% | 49.9% | 49.5% |
| Median Age | 37.9 | 35.2 | 38.4 |
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| Population - 2010 | 5,157 | 105,652 | 309,327,143 |
| Population - 2000 | 4,590 | 96,178 | 285,036,114 |
| Population - 1990 | 4,490 | 77,211 | 251,960,433 |
| Pop. 2000 to Now | 27.4% | 22.3% | 15.6% |
| Pop. 1990 to Now | 30.2% | 52.3% | 30.8% |
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| Population Density | 1,979.4 | 2,899.5 | 93.4 |
| Land Area | 2.6 | 41.0 | 3,531,905.4 |
| Water Area | 0.2 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | El Cerrito CDP (Riverside County), CA | Fairfield, CA | United States |
| Age 0 to 4 | 8.1% | 7.4% | 5.9% |
| Age 5 to 9 | 2.3% | 6.2% | 6.1% |
| Age 10 to 14 | 6.0% | 7.6% | 6.6% |
| Age 15 to 17 | 6.6% | 4.1% | 3.9% |
| Age 18 to 20 | 4.1% | 3.6% | 4.0% |
| Age 21 to 24 | 3.2% | 5.4% | 5.2% |
| Age 25 to 34 | 11.7% | 15.5% | 13.8% |
| Age 35 to 44 | 14.1% | 13.7% | 12.9% |
| Age 45 to 54 | 13.9% | 12.3% | 12.6% |
| Age 55 to 59 | 10.8% | 5.7% | 6.7% |
| Age 60 to 64 | 7.6% | 5.5% | 6.3% |
| Age 65 to 74 | 6.7% | 7.8% | 9.6% |
| Age 75 to 84 | 3.0% | 3.7% | 4.5% |
| Age 85 and over | 1.8% | 1.5% | 1.9% |
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| Race | | | |
| | El Cerrito CDP (Riverside County), CA | Fairfield, CA | United States |
| White | 43.8% | 29.0% | 59.4% |
| Black | 0.3% | 15.6% | 12.2% |
| Asian | 3.5% | 17.4% | 5.6% |
| Native American | 0.0% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.2% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 5.3% | 6.7% | 3.2% |
| Hispanic | 47.1% | 29.3% | 18.4% |
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| Marriage & Family | | | |
| | El Cerrito CDP (Riverside County), CA | Fairfield, CA | United States |
| Married Population | 48.6% | 51.5% | 49.8% |
| Currently Married | 47.0% | 49.2% | 48.0% |
| Married but Separated | 1.6% | 2.3% | 1.8% |
| Single Population | 51.4% | 48.5% | 50.2% |
| Never Married | 36.9% | 35.1% | 33.8% |
| Divorced | 8.3% | 8.6% | 10.8% |
| Widowed | 6.1% | 4.9% | 5.6% |
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| Household Size | 3.62 | 3.16 | 2.60 |
| Households | 1,401 | 37,176 | 124,010,992 |
| Family Households | 1,153 | 28,037 | 80,755,759 |
| Married couple, w/children | 29.1% | 34.1% | 30.5% |
| Married couple, no children | 44.0% | 37.1% | 42.9% |
| Non Family Households | 248 | 9,139 | 43,255,233 |
| Single householder, w/children | 15.7% | 17.8% | 15.8% |
| Single householder, no children | 11.3% | 11.0% | 10.8% |