| | Richmond, KY | Carlsbad, CA | United States |
| Population | 34,662 | 114,858 | 329,725,481 |
| Female Population | 52.4% | 50.4% | 50.5% |
| Male Population | 47.6% | 49.6% | 49.5% |
| Median Age | 26.3 | 42.5 | 38.4 |
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| Population - 2010 | 31,694 | 105,768 | 309,327,143 |
| Population - 2000 | 27,152 | 78,247 | 285,036,114 |
| Population - 1990 | 21,155 | 63,126 | 251,960,433 |
| Pop. 2000 to Now | 35.5% | 47.7% | 15.6% |
| Pop. 1990 to Now | 74.0% | 83.1% | 30.8% |
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| Population Density | 1,705.6 | 3,042.6 | 93.4 |
| Land Area | 20.3 | 37.8 | 3,531,905.4 |
| Water Area | 0.3 | 1.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Richmond, KY | Carlsbad, CA | United States |
| Age 0 to 4 | 5.0% | 4.4% | 5.9% |
| Age 5 to 9 | 5.0% | 5.7% | 6.1% |
| Age 10 to 14 | 4.8% | 8.0% | 6.6% |
| Age 15 to 17 | 2.8% | 4.7% | 3.9% |
| Age 18 to 20 | 13.0% | 2.6% | 4.0% |
| Age 21 to 24 | 15.9% | 3.7% | 5.2% |
| Age 25 to 34 | 14.9% | 10.9% | 13.8% |
| Age 35 to 44 | 12.2% | 13.7% | 12.9% |
| Age 45 to 54 | 7.8% | 14.6% | 12.6% |
| Age 55 to 59 | 3.6% | 8.0% | 6.7% |
| Age 60 to 64 | 3.9% | 6.5% | 6.3% |
| Age 65 to 74 | 5.9% | 9.3% | 9.6% |
| Age 75 to 84 | 3.5% | 5.6% | 4.5% |
| Age 85 and over | 1.6% | 2.4% | 1.9% |
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| Race | | | |
| | Richmond, KY | Carlsbad, CA | United States |
| White | 86.0% | 67.9% | 59.4% |
| Black | 6.0% | 1.2% | 12.2% |
| Asian | 1.3% | 9.4% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.5% | 0.2% | 0.2% |
| Other | 0.1% | 0.3% | 0.4% |
| Two or More Races | 2.9% | 5.0% | 3.2% |
| Hispanic | 3.0% | 15.9% | 18.4% |
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| Marriage & Family | | | |
| | Richmond, KY | Carlsbad, CA | United States |
| Married Population | 34.1% | 57.6% | 49.8% |
| Currently Married | 31.5% | 56.6% | 48.0% |
| Married but Separated | 2.6% | 1.0% | 1.8% |
| Single Population | 65.9% | 42.4% | 50.2% |
| Never Married | 47.1% | 27.3% | 33.8% |
| Divorced | 14.4% | 11.2% | 10.8% |
| Widowed | 4.4% | 3.9% | 5.6% |
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| Household Size | 2.19 | 2.58 | 2.60 |
| Households | 13,804 | 44,350 | 124,010,992 |
| Family Households | 6,475 | 31,144 | 80,755,759 |
| Married couple, w/children | 26.4% | 34.6% | 30.5% |
| Married couple, no children | 38.3% | 45.8% | 42.9% |
| Non Family Households | 7,329 | 13,206 | 43,255,233 |
| Single householder, w/children | 25.3% | 10.5% | 15.8% |
| Single householder, no children | 10.0% | 9.2% | 10.8% |