| | Harlan, KY | Nucla, CO | United States |
| Population | 1,529 | 578 | 329,725,481 |
| Female Population | 52.0% | 54.2% | 50.5% |
| Male Population | 48.0% | 45.9% | 49.5% |
| Median Age | 42.1 | 52.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,735 | 709 | 309,327,143 |
| Population - 2000 | 2,081 | 734 | 285,036,114 |
| Population - 1990 | 2,686 | 656 | 251,960,433 |
| Pop. 2000 to Now | -29.3% | -6.3% | 15.6% |
| Pop. 1990 to Now | -45.2% | 4.9% | 30.8% |
| space4 | | | |
| Population Density | 1,176.2 | 803.9 | 93.4 |
| Land Area | 1.3 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Harlan, KY | Nucla, CO | United States |
| Age 0 to 4 | 4.9% | 3.1% | 5.9% |
| Age 5 to 9 | 4.3% | 5.9% | 6.1% |
| Age 10 to 14 | 5.2% | 6.1% | 6.6% |
| Age 15 to 17 | 4.5% | 2.8% | 3.9% |
| Age 18 to 20 | 1.9% | 3.1% | 4.0% |
| Age 21 to 24 | 4.2% | 4.8% | 5.2% |
| Age 25 to 34 | 15.3% | 7.6% | 13.8% |
| Age 35 to 44 | 15.4% | 11.2% | 12.9% |
| Age 45 to 54 | 11.4% | 7.8% | 12.6% |
| Age 55 to 59 | 6.1% | 5.5% | 6.7% |
| Age 60 to 64 | 8.9% | 9.0% | 6.3% |
| Age 65 to 74 | 10.5% | 22.0% | 9.6% |
| Age 75 to 84 | 5.4% | 4.8% | 4.5% |
| Age 85 and over | 2.2% | 6.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Harlan, KY | Nucla, CO | United States |
| White | 88.7% | 94.3% | 59.4% |
| Black | 7.0% | 4.2% | 12.2% |
| Asian | 2.6% | 0.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.5% | 0.0% | 3.2% |
| Hispanic | 0.2% | 1.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Harlan, KY | Nucla, CO | United States |
| Married Population | 44.5% | 60.5% | 49.8% |
| Currently Married | 41.6% | 60.5% | 48.0% |
| Married but Separated | 2.9% | 0.0% | 1.8% |
| Single Population | 55.5% | 39.5% | 50.2% |
| Never Married | 30.2% | 15.3% | 33.8% |
| Divorced | 15.6% | 16.9% | 10.8% |
| Widowed | 9.8% | 7.3% | 5.6% |
| space5 | | | |
| Household Size | 2.18 | 2.09 | 2.60 |
| Households | 701 | 276 | 124,010,992 |
| Family Households | 358 | 167 | 80,755,759 |
| Married couple, w/children | 19.6% | 19.8% | 30.5% |
| Married couple, no children | 41.3% | 56.3% | 42.9% |
| Non Family Households | 343 | 109 | 43,255,233 |
| Single householder, w/children | 25.1% | 17.4% | 15.8% |
| Single householder, no children | 14.0% | 6.6% | 10.8% |