| | Mountain View CDP (Contra Costa County), CA | El Cerrito, CA | United States |
| Population | 1,868 | 25,898 | 329,725,481 |
| Female Population | 55.0% | 52.5% | 50.5% |
| Male Population | 45.0% | 47.5% | 49.5% |
| Median Age | 37.4 | 42 | 38.4 |
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| Population - 2010 | 2,099 | 23,653 | 309,327,143 |
| Population - 2000 | 2,468 | 23,171 | 285,036,114 |
| Population - 1990 | 2,225 | 22,869 | 251,960,433 |
| Pop. 2000 to Now | -0.4% | 9.6% | 15.6% |
| Pop. 1990 to Now | 10.5% | 11.1% | 30.8% |
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| Population Density | 6,508.7 | 7,081.8 | 93.4 |
| Land Area | 0.3 | 3.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Mountain View CDP (Contra Costa County), CA | El Cerrito, CA | United States |
| Age 0 to 4 | 5.2% | 5.8% | 5.9% |
| Age 5 to 9 | 4.4% | 4.7% | 6.1% |
| Age 10 to 14 | 5.7% | 4.6% | 6.6% |
| Age 15 to 17 | 4.0% | 2.3% | 3.9% |
| Age 18 to 20 | 0.5% | 2.1% | 4.0% |
| Age 21 to 24 | 4.8% | 3.9% | 5.2% |
| Age 25 to 34 | 17.1% | 13.4% | 13.8% |
| Age 35 to 44 | 18.1% | 17.7% | 12.9% |
| Age 45 to 54 | 19.2% | 12.8% | 12.6% |
| Age 55 to 59 | 5.3% | 6.2% | 6.7% |
| Age 60 to 64 | 4.4% | 6.8% | 6.3% |
| Age 65 to 74 | 4.9% | 11.8% | 9.6% |
| Age 75 to 84 | 5.5% | 5.5% | 4.5% |
| Age 85 and over | 0.7% | 2.6% | 1.9% |
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| Race | | | |
| | Mountain View CDP (Contra Costa County), CA | El Cerrito, CA | United States |
| White | 69.3% | 46.5% | 59.4% |
| Black | 4.8% | 4.2% | 12.2% |
| Asian | 0.5% | 28.6% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.7% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 3.6% | 6.5% | 3.2% |
| Hispanic | 21.7% | 12.5% | 18.4% |
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| Marriage & Family | | | |
| | Mountain View CDP (Contra Costa County), CA | El Cerrito, CA | United States |
| Married Population | 60.5% | 55.1% | 49.8% |
| Currently Married | 57.2% | 53.8% | 48.0% |
| Married but Separated | 3.3% | 1.3% | 1.8% |
| Single Population | 39.5% | 44.9% | 50.2% |
| Never Married | 27.7% | 31.4% | 33.8% |
| Divorced | 9.1% | 8.5% | 10.8% |
| Widowed | 2.7% | 5.1% | 5.6% |
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| Household Size | 2.35 | 2.44 | 2.60 |
| Households | 778 | 10,569 | 124,010,992 |
| Family Households | 548 | 6,662 | 80,755,759 |
| Married couple, w/children | 31.2% | 33.9% | 30.5% |
| Married couple, no children | 34.3% | 47.5% | 42.9% |
| Non Family Households | 230 | 3,907 | 43,255,233 |
| Single householder, w/children | 9.7% | 7.7% | 15.8% |
| Single householder, no children | 24.8% | 11.0% | 10.8% |