| | Louisville, CO | Evergreen, CO | United States |
| Population | 21,091 | 9,338 | 329,725,481 |
| Female Population | 49.4% | 51.6% | 50.5% |
| Male Population | 50.6% | 48.5% | 49.5% |
| Median Age | 42.5 | 45.5 | 38.4 |
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| Population - 2010 | 18,412 | 9,140 | 309,327,143 |
| Population - 2000 | 18,937 | 9,216 | 285,036,114 |
| Population - 1990 | 12,361 | 7,582 | 251,960,433 |
| Pop. 2000 to Now | 0.7% | -4.6% | 15.6% |
| Pop. 1990 to Now | 54.2% | 15.9% | 30.8% |
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| Population Density | 2,644.0 | 810.4 | 93.4 |
| Land Area | 8.0 | 11.5 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Louisville, CO | Evergreen, CO | United States |
| Age 0 to 4 | 4.5% | 4.5% | 5.9% |
| Age 5 to 9 | 6.8% | 5.8% | 6.1% |
| Age 10 to 14 | 8.0% | 8.0% | 6.6% |
| Age 15 to 17 | 4.3% | 4.0% | 3.9% |
| Age 18 to 20 | 2.8% | 2.0% | 4.0% |
| Age 21 to 24 | 3.4% | 2.2% | 5.2% |
| Age 25 to 34 | 11.2% | 7.5% | 13.8% |
| Age 35 to 44 | 13.0% | 14.8% | 12.9% |
| Age 45 to 54 | 15.1% | 14.4% | 12.6% |
| Age 55 to 59 | 8.6% | 7.9% | 6.7% |
| Age 60 to 64 | 8.0% | 8.6% | 6.3% |
| Age 65 to 74 | 9.0% | 14.1% | 9.6% |
| Age 75 to 84 | 3.0% | 4.2% | 4.5% |
| Age 85 and over | 2.3% | 2.0% | 1.9% |
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| Race | | | |
| | Louisville, CO | Evergreen, CO | United States |
| White | 82.3% | 89.5% | 59.4% |
| Black | 0.6% | 0.8% | 12.2% |
| Asian | 4.1% | 0.9% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 4.0% | 2.1% | 3.2% |
| Hispanic | 8.8% | 6.6% | 18.4% |
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| Marriage & Family | | | |
| | Louisville, CO | Evergreen, CO | United States |
| Married Population | 56.9% | 64.6% | 49.8% |
| Currently Married | 56.6% | 63.6% | 48.0% |
| Married but Separated | 0.3% | 1.0% | 1.8% |
| Single Population | 43.1% | 35.4% | 50.2% |
| Never Married | 27.8% | 18.1% | 33.8% |
| Divorced | 10.9% | 13.8% | 10.8% |
| Widowed | 4.4% | 3.5% | 5.6% |
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| Household Size | 2.50 | 2.48 | 2.60 |
| Households | 8,400 | 3,761 | 124,010,992 |
| Family Households | 5,519 | 2,698 | 80,755,759 |
| Married couple, w/children | 38.7% | 31.2% | 30.5% |
| Married couple, no children | 43.2% | 55.1% | 42.9% |
| Non Family Households | 2,881 | 1,063 | 43,255,233 |
| Single householder, w/children | 12.2% | 9.0% | 15.8% |
| Single householder, no children | 5.9% | 4.7% | 10.8% |