| | Delta, CO | Dolores, CO | United States |
| Population | 9,036 | 865 | 329,725,481 |
| Female Population | 49.5% | 34.2% | 50.5% |
| Male Population | 50.5% | 65.8% | 49.5% |
| Median Age | 44.9 | 38.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,865 | 929 | 309,327,143 |
| Population - 2000 | 6,400 | 857 | 285,036,114 |
| Population - 1990 | 3,789 | 866 | 251,960,433 |
| Pop. 2000 to Now | 41.1% | 12.5% | 15.6% |
| Pop. 1990 to Now | 138.3% | 11.3% | 30.8% |
| space4 | | | |
| Population Density | 680.8 | 1,188.2 | 93.4 |
| Land Area | 13.3 | 0.7 | 3,531,905.4 |
| Water Area | 0.3 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Delta, CO | Dolores, CO | United States |
| Age 0 to 4 | 3.7% | 0.8% | 5.9% |
| Age 5 to 9 | 7.1% | 2.2% | 6.1% |
| Age 10 to 14 | 6.8% | 6.9% | 6.6% |
| Age 15 to 17 | 3.7% | 5.0% | 3.9% |
| Age 18 to 20 | 3.9% | 0.9% | 4.0% |
| Age 21 to 24 | 5.7% | 5.0% | 5.2% |
| Age 25 to 34 | 8.0% | 25.7% | 13.8% |
| Age 35 to 44 | 11.3% | 17.5% | 12.9% |
| Age 45 to 54 | 13.0% | 4.9% | 12.6% |
| Age 55 to 59 | 5.4% | 10.3% | 6.7% |
| Age 60 to 64 | 8.8% | 3.9% | 6.3% |
| Age 65 to 74 | 13.3% | 13.8% | 9.6% |
| Age 75 to 84 | 5.6% | 3.2% | 4.5% |
| Age 85 and over | 3.8% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Delta, CO | Dolores, CO | United States |
| White | 69.5% | 64.0% | 59.4% |
| Black | 0.3% | 17.8% | 12.2% |
| Asian | 2.4% | 0.0% | 5.6% |
| Native American | 0.9% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.9% | 0.4% |
| Two or More Races | 2.0% | 3.8% | 3.2% |
| Hispanic | 24.8% | 13.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Delta, CO | Dolores, CO | United States |
| Married Population | 46.2% | 49.8% | 49.8% |
| Currently Married | 44.9% | 49.8% | 48.0% |
| Married but Separated | 1.3% | 0.0% | 1.8% |
| Single Population | 53.8% | 50.2% | 50.2% |
| Never Married | 26.8% | 28.0% | 33.8% |
| Divorced | 18.4% | 20.2% | 10.8% |
| Widowed | 8.6% | 2.1% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 1.65 | 2.60 |
| Households | 3,387 | 525 | 124,010,992 |
| Family Households | 2,025 | 134 | 80,755,759 |
| Married couple, w/children | 29.0% | 23.9% | 30.5% |
| Married couple, no children | 39.7% | 56.7% | 42.9% |
| Non Family Households | 1,362 | 391 | 43,255,233 |
| Single householder, w/children | 14.8% | 14.2% | 15.8% |
| Single householder, no children | 16.4% | 5.2% | 10.8% |