| | Big Sky, MT | Melbourne Beach, FL | United States |
| Population | 3,141 | 3,219 | 329,725,481 |
| Female Population | 49.5% | 49.1% | 50.5% |
| Male Population | 50.5% | 50.9% | 49.5% |
| Median Age | 36.6 | 53.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,528 | 3,097 | 309,327,143 |
| Population - 2000 | 1,221 | 3,335 | 285,036,114 |
| Population - 1990 | 686 | 3,021 | 251,960,433 |
| Pop. 2000 to Now | 174.9% | -1.1% | 15.6% |
| Pop. 1990 to Now | 389.4% | 9.2% | 30.8% |
| space4 | | | |
| Population Density | 26.2 | 3,258.1 | 93.4 |
| Land Area | 120.0 | 1.0 | 3,531,905.4 |
| Water Area | 0.2 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Big Sky, MT | Melbourne Beach, FL | United States |
| Age 0 to 4 | 5.0% | 6.2% | 5.9% |
| Age 5 to 9 | 6.9% | 3.2% | 6.1% |
| Age 10 to 14 | 4.3% | 6.4% | 6.6% |
| Age 15 to 17 | 1.9% | 3.0% | 3.9% |
| Age 18 to 20 | 1.7% | 2.0% | 4.0% |
| Age 21 to 24 | 6.3% | 1.6% | 5.2% |
| Age 25 to 34 | 20.8% | 6.6% | 13.8% |
| Age 35 to 44 | 22.3% | 11.7% | 12.9% |
| Age 45 to 54 | 12.4% | 12.0% | 12.6% |
| Age 55 to 59 | 6.1% | 10.0% | 6.7% |
| Age 60 to 64 | 3.4% | 9.0% | 6.3% |
| Age 65 to 74 | 8.2% | 13.6% | 9.6% |
| Age 75 to 84 | 0.7% | 11.8% | 4.5% |
| Age 85 and over | 0.2% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Big Sky, MT | Melbourne Beach, FL | United States |
| White | 86.8% | 87.4% | 59.4% |
| Black | 0.1% | 0.0% | 12.2% |
| Asian | 0.3% | 1.4% | 5.6% |
| Native American | 0.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.9% | 1.8% | 3.2% |
| Hispanic | 11.3% | 9.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Big Sky, MT | Melbourne Beach, FL | United States |
| Married Population | 54.4% | 62.2% | 49.8% |
| Currently Married | 54.0% | 61.3% | 48.0% |
| Married but Separated | 0.4% | 0.9% | 1.8% |
| Single Population | 45.6% | 37.8% | 50.2% |
| Never Married | 35.6% | 18.0% | 33.8% |
| Divorced | 8.0% | 11.8% | 10.8% |
| Widowed | 2.0% | 7.9% | 5.6% |
| space5 | | | |
| Household Size | 2.33 | 2.31 | 2.60 |
| Households | 1,193 | 1,395 | 124,010,992 |
| Family Households | 767 | 853 | 80,755,759 |
| Married couple, w/children | 33.1% | 30.0% | 30.5% |
| Married couple, no children | 53.2% | 64.0% | 42.9% |
| Non Family Households | 426 | 542 | 43,255,233 |
| Single householder, w/children | 9.6% | 1.5% | 15.8% |
| Single householder, no children | 4.0% | 4.5% | 10.8% |