| | San Jacinto, CA | Mansfield, TX | United States |
| Population | 53,299 | 71,375 | 329,725,481 |
| Female Population | 51.5% | 51.3% | 50.5% |
| Male Population | 48.5% | 48.8% | 49.5% |
| Median Age | 31.7 | 37.5 | 38.4 |
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| Population - 2010 | 44,383 | 57,091 | 309,327,143 |
| Population - 2000 | 23,779 | 28,031 | 285,036,114 |
| Population - 1990 | 16,210 | 15,607 | 251,960,433 |
| Pop. 2000 to Now | 115.0% | 160.8% | 15.6% |
| Pop. 1990 to Now | 215.4% | 368.3% | 30.8% |
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| Population Density | 2,072.8 | 1,948.2 | 93.4 |
| Land Area | 25.7 | 36.6 | 3,531,905.4 |
| Water Area | 0.4 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | San Jacinto, CA | Mansfield, TX | United States |
| Age 0 to 4 | 6.9% | 5.4% | 5.9% |
| Age 5 to 9 | 6.3% | 7.0% | 6.1% |
| Age 10 to 14 | 8.8% | 10.7% | 6.6% |
| Age 15 to 17 | 6.4% | 5.7% | 3.9% |
| Age 18 to 20 | 5.3% | 4.1% | 4.0% |
| Age 21 to 24 | 5.6% | 4.1% | 5.2% |
| Age 25 to 34 | 14.5% | 10.3% | 13.8% |
| Age 35 to 44 | 13.1% | 14.8% | 12.9% |
| Age 45 to 54 | 12.8% | 14.9% | 12.6% |
| Age 55 to 59 | 5.2% | 7.0% | 6.7% |
| Age 60 to 64 | 4.2% | 4.7% | 6.3% |
| Age 65 to 74 | 6.6% | 6.4% | 9.6% |
| Age 75 to 84 | 3.4% | 3.9% | 4.5% |
| Age 85 and over | 1.0% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | San Jacinto, CA | Mansfield, TX | United States |
| White | 26.8% | 52.7% | 59.4% |
| Black | 6.7% | 22.2% | 12.2% |
| Asian | 2.9% | 3.7% | 5.6% |
| Native American | 0.9% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.3% | 0.0% | 0.2% |
| Other | 0.2% | 0.4% | 0.4% |
| Two or More Races | 3.6% | 3.7% | 3.2% |
| Hispanic | 58.6% | 17.2% | 18.4% |
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| Marriage & Family | | | |
| | San Jacinto, CA | Mansfield, TX | United States |
| Married Population | 46.4% | 59.5% | 49.8% |
| Currently Married | 43.9% | 58.3% | 48.0% |
| Married but Separated | 2.6% | 1.2% | 1.8% |
| Single Population | 53.6% | 40.5% | 50.2% |
| Never Married | 39.4% | 28.9% | 33.8% |
| Divorced | 10.1% | 8.1% | 10.8% |
| Widowed | 4.1% | 3.6% | 5.6% |
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| Household Size | 3.60 | 3.07 | 2.60 |
| Households | 14,739 | 23,135 | 124,010,992 |
| Family Households | 11,451 | 18,484 | 80,755,759 |
| Married couple, w/children | 39.6% | 43.2% | 30.5% |
| Married couple, no children | 28.3% | 37.2% | 42.9% |
| Non Family Households | 3,288 | 4,651 | 43,255,233 |
| Single householder, w/children | 19.2% | 14.1% | 15.8% |
| Single householder, no children | 12.9% | 5.5% | 10.8% |