| | El Centro, CA | Richmond, TX | United States |
| Population | 44,322 | 11,768 | 329,725,481 |
| Female Population | 51.0% | 53.7% | 50.5% |
| Male Population | 49.0% | 46.4% | 49.5% |
| Median Age | 31.1 | 33.7 | 38.4 |
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| Population - 2010 | 42,783 | 12,125 | 309,327,143 |
| Population - 2000 | 37,835 | 11,081 | 285,036,114 |
| Population - 1990 | 31,384 | 9,801 | 251,960,433 |
| Pop. 2000 to Now | 15.2% | 12.7% | 15.6% |
| Pop. 1990 to Now | 38.9% | 27.4% | 30.8% |
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| Population Density | 3,851.1 | 2,854.9 | 93.4 |
| Land Area | 11.5 | 4.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | El Centro, CA | Richmond, TX | United States |
| Age 0 to 4 | 6.9% | 5.7% | 5.9% |
| Age 5 to 9 | 9.1% | 4.2% | 6.1% |
| Age 10 to 14 | 10.1% | 8.0% | 6.6% |
| Age 15 to 17 | 5.5% | 3.1% | 3.9% |
| Age 18 to 20 | 4.5% | 5.5% | 4.0% |
| Age 21 to 24 | 5.5% | 5.8% | 5.2% |
| Age 25 to 34 | 13.2% | 22.0% | 13.8% |
| Age 35 to 44 | 11.6% | 10.1% | 12.9% |
| Age 45 to 54 | 10.3% | 9.0% | 12.6% |
| Age 55 to 59 | 5.1% | 6.8% | 6.7% |
| Age 60 to 64 | 5.7% | 6.5% | 6.3% |
| Age 65 to 74 | 6.5% | 5.7% | 9.6% |
| Age 75 to 84 | 3.9% | 4.7% | 4.5% |
| Age 85 and over | 2.2% | 3.0% | 1.9% |
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| Race | | | |
| | El Centro, CA | Richmond, TX | United States |
| White | 7.3% | 21.9% | 59.4% |
| Black | 2.5% | 22.1% | 12.2% |
| Asian | 1.4% | 4.8% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.2% | 0.7% | 3.2% |
| Hispanic | 88.6% | 50.5% | 18.4% |
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| Marriage & Family | | | |
| | El Centro, CA | Richmond, TX | United States |
| Married Population | 44.6% | 33.5% | 49.8% |
| Currently Married | 40.8% | 31.1% | 48.0% |
| Married but Separated | 3.8% | 2.4% | 1.8% |
| Single Population | 55.4% | 66.5% | 50.2% |
| Never Married | 39.9% | 45.2% | 33.8% |
| Divorced | 8.5% | 12.9% | 10.8% |
| Widowed | 7.0% | 8.4% | 5.6% |
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| Household Size | 3.72 | 2.68 | 2.60 |
| Households | 11,798 | 3,946 | 124,010,992 |
| Family Households | 9,243 | 2,487 | 80,755,759 |
| Married couple, w/children | 31.4% | 17.2% | 30.5% |
| Married couple, no children | 29.2% | 23.4% | 42.9% |
| Non Family Households | 2,555 | 1,459 | 43,255,233 |
| Single householder, w/children | 22.6% | 28.3% | 15.8% |
| Single householder, no children | 16.8% | 31.0% | 10.8% |