| | Calexico, CA | Idaho Springs, CO | United States |
| Population | 38,798 | 2,044 | 329,725,481 |
| Female Population | 53.3% | 54.4% | 50.5% |
| Male Population | 46.8% | 45.6% | 49.5% |
| Median Age | 33.3 | 40.5 | 38.4 |
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| Population - 2010 | 38,660 | 1,724 | 309,327,143 |
| Population - 2000 | 27,109 | 1,889 | 285,036,114 |
| Population - 1990 | 18,633 | 1,834 | 251,960,433 |
| Pop. 2000 to Now | 45.9% | -1.7% | 15.6% |
| Pop. 1990 to Now | 112.2% | 1.3% | 30.8% |
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| Population Density | 4,494.7 | 908.4 | 93.4 |
| Land Area | 8.6 | 2.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Calexico, CA | Idaho Springs, CO | United States |
| Age 0 to 4 | 7.8% | 2.6% | 5.9% |
| Age 5 to 9 | 7.0% | 3.6% | 6.1% |
| Age 10 to 14 | 9.6% | 0.6% | 6.6% |
| Age 15 to 17 | 4.9% | 1.8% | 3.9% |
| Age 18 to 20 | 3.7% | 2.6% | 4.0% |
| Age 21 to 24 | 4.7% | 13.3% | 5.2% |
| Age 25 to 34 | 14.1% | 19.8% | 13.8% |
| Age 35 to 44 | 10.7% | 10.5% | 12.9% |
| Age 45 to 54 | 11.6% | 11.2% | 12.6% |
| Age 55 to 59 | 5.4% | 7.8% | 6.7% |
| Age 60 to 64 | 5.0% | 8.5% | 6.3% |
| Age 65 to 74 | 9.7% | 13.4% | 9.6% |
| Age 75 to 84 | 4.2% | 2.8% | 4.5% |
| Age 85 and over | 1.6% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Calexico, CA | Idaho Springs, CO | United States |
| White | 1.0% | 80.2% | 59.4% |
| Black | 0.3% | 2.8% | 12.2% |
| Asian | 0.8% | 0.0% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.3% | 0.4% |
| Two or More Races | 0.0% | 2.3% | 3.2% |
| Hispanic | 97.8% | 13.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Calexico, CA | Idaho Springs, CO | United States |
| Married Population | 47.7% | 47.0% | 49.8% |
| Currently Married | 45.0% | 46.3% | 48.0% |
| Married but Separated | 2.7% | 0.6% | 1.8% |
| Single Population | 52.3% | 53.0% | 50.2% |
| Never Married | 39.6% | 34.1% | 33.8% |
| Divorced | 5.5% | 14.7% | 10.8% |
| Widowed | 7.3% | 4.2% | 5.6% |
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| Household Size | 4.31 | 2.37 | 2.60 |
| Households | 8,994 | 863 | 124,010,992 |
| Family Households | 6,865 | 499 | 80,755,759 |
| Married couple, w/children | 33.7% | 29.7% | 30.5% |
| Married couple, no children | 31.4% | 54.1% | 42.9% |
| Non Family Households | 2,129 | 364 | 43,255,233 |
| Single householder, w/children | 21.9% | 0.0% | 15.8% |
| Single householder, no children | 12.9% | 16.2% | 10.8% |