| | Pacheco, CA | Martinez, CA | United States |
| Population | 5,129 | 37,308 | 329,725,481 |
| Female Population | 52.9% | 51.4% | 50.5% |
| Male Population | 47.1% | 48.6% | 49.5% |
| Median Age | 41.7 | 41.8 | 38.4 |
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| Population - 2010 | 3,241 | 36,150 | 309,327,143 |
| Population - 2000 | 3,562 | 35,866 | 285,036,114 |
| Population - 1990 | 3,325 | 31,808 | 251,960,433 |
| Pop. 2000 to Now | 24.7% | 6.0% | 15.6% |
| Pop. 1990 to Now | 33.6% | 19.6% | 30.8% |
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| Population Density | 6,921.7 | 2,953.7 | 93.4 |
| Land Area | 0.7 | 12.6 | 3,531,905.4 |
| Water Area | 0.0 | 1.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Pacheco, CA | Martinez, CA | United States |
| Age 0 to 4 | 3.8% | 7.1% | 5.9% |
| Age 5 to 9 | 3.0% | 5.1% | 6.1% |
| Age 10 to 14 | 6.0% | 5.7% | 6.6% |
| Age 15 to 17 | 4.1% | 2.6% | 3.9% |
| Age 18 to 20 | 5.0% | 3.0% | 4.0% |
| Age 21 to 24 | 4.3% | 4.2% | 5.2% |
| Age 25 to 34 | 11.7% | 12.0% | 13.8% |
| Age 35 to 44 | 17.9% | 15.3% | 12.9% |
| Age 45 to 54 | 17.4% | 13.2% | 12.6% |
| Age 55 to 59 | 6.8% | 7.9% | 6.7% |
| Age 60 to 64 | 6.9% | 7.8% | 6.3% |
| Age 65 to 74 | 8.4% | 9.7% | 9.6% |
| Age 75 to 84 | 3.8% | 4.4% | 4.5% |
| Age 85 and over | 1.0% | 2.1% | 1.9% |
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| Race | | | |
| | Pacheco, CA | Martinez, CA | United States |
| White | 46.7% | 61.0% | 59.4% |
| Black | 6.7% | 3.1% | 12.2% |
| Asian | 17.0% | 9.8% | 5.6% |
| Native American | 0.4% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.4% | 0.4% |
| Two or More Races | 5.5% | 6.6% | 3.2% |
| Hispanic | 23.3% | 18.9% | 18.4% |
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| Marriage & Family | | | |
| | Pacheco, CA | Martinez, CA | United States |
| Married Population | 45.0% | 53.6% | 49.8% |
| Currently Married | 42.5% | 52.0% | 48.0% |
| Married but Separated | 2.5% | 1.6% | 1.8% |
| Single Population | 55.0% | 46.4% | 50.2% |
| Never Married | 34.6% | 29.9% | 33.8% |
| Divorced | 11.6% | 12.4% | 10.8% |
| Widowed | 8.7% | 4.1% | 5.6% |
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| Household Size | 2.68 | 2.48 | 2.60 |
| Households | 1,916 | 14,825 | 124,010,992 |
| Family Households | 1,410 | 9,684 | 80,755,759 |
| Married couple, w/children | 31.1% | 33.5% | 30.5% |
| Married couple, no children | 29.4% | 43.7% | 42.9% |
| Non Family Households | 506 | 5,141 | 43,255,233 |
| Single householder, w/children | 19.4% | 12.8% | 15.8% |
| Single householder, no children | 20.1% | 9.9% | 10.8% |