| | Dillon, CO | Mammoth Lakes, CA | United States |
| Population | 1,147 | 7,321 | 329,725,481 |
| Female Population | 49.8% | 50.1% | 50.5% |
| Male Population | 50.2% | 49.9% | 49.5% |
| Median Age | 46 | 37.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 905 | 8,230 | 309,327,143 |
| Population - 2000 | 802 | 7,093 | 285,036,114 |
| Population - 1990 | 553 | 4,785 | 251,960,433 |
| Pop. 2000 to Now | 20.6% | 17.3% | 15.6% |
| Pop. 1990 to Now | 74.9% | 73.8% | 30.8% |
| space4 | | | |
| Population Density | 731.0 | 294.4 | 93.4 |
| Land Area | 1.6 | 24.9 | 3,531,905.4 |
| Water Area | 0.9 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Dillon, CO | Mammoth Lakes, CA | United States |
| Age 0 to 4 | 2.0% | 3.4% | 5.9% |
| Age 5 to 9 | 0.0% | 7.1% | 6.1% |
| Age 10 to 14 | 4.0% | 10.8% | 6.6% |
| Age 15 to 17 | 3.3% | 3.3% | 3.9% |
| Age 18 to 20 | 4.1% | 1.7% | 4.0% |
| Age 21 to 24 | 0.1% | 3.9% | 5.2% |
| Age 25 to 34 | 20.1% | 14.9% | 13.8% |
| Age 35 to 44 | 14.8% | 17.2% | 12.9% |
| Age 45 to 54 | 12.8% | 15.2% | 12.6% |
| Age 55 to 59 | 10.8% | 7.3% | 6.7% |
| Age 60 to 64 | 10.1% | 6.5% | 6.3% |
| Age 65 to 74 | 11.3% | 5.3% | 9.6% |
| Age 75 to 84 | 6.5% | 3.4% | 4.5% |
| Age 85 and over | 0.0% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Dillon, CO | Mammoth Lakes, CA | United States |
| White | 55.8% | 61.0% | 59.4% |
| Black | 0.6% | 0.0% | 12.2% |
| Asian | 4.6% | 5.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 6.6% | 0.0% | 0.2% |
| Other | 0.0% | 2.0% | 0.4% |
| Two or More Races | 0.6% | 0.3% | 3.2% |
| Hispanic | 31.7% | 31.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Dillon, CO | Mammoth Lakes, CA | United States |
| Married Population | 56.1% | 50.2% | 49.8% |
| Currently Married | 51.9% | 46.5% | 48.0% |
| Married but Separated | 4.3% | 3.6% | 1.8% |
| Single Population | 43.9% | 49.8% | 50.2% |
| Never Married | 28.5% | 36.0% | 33.8% |
| Divorced | 13.9% | 9.8% | 10.8% |
| Widowed | 1.5% | 4.0% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 2.34 | 2.60 |
| Households | 441 | 3,072 | 124,010,992 |
| Family Households | 247 | 1,490 | 80,755,759 |
| Married couple, w/children | 1.2% | 37.0% | 30.5% |
| Married couple, no children | 74.5% | 48.8% | 42.9% |
| Non Family Households | 194 | 1,582 | 43,255,233 |
| Single householder, w/children | 15.0% | 5.6% | 15.8% |
| Single householder, no children | 9.3% | 8.6% | 10.8% |