| | Mountain, WI | Belhaven, NC | United States |
| Population | 972 | 1,398 | 329,725,481 |
| Female Population | 50.0% | 54.7% | 50.5% |
| Male Population | 50.0% | 45.3% | 49.5% |
| Median Age | 56.7 | 46.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 823 | 1,691 | 309,327,143 |
| Population - 2000 | 860 | 1,968 | 285,036,114 |
| Population - 1990 | 637 | 2,269 | 251,960,433 |
| Pop. 2000 to Now | -1.1% | -19.6% | 15.6% |
| Pop. 1990 to Now | 33.6% | -30.3% | 30.8% |
| space4 | | | |
| Population Density | 13.6 | 878.7 | 93.4 |
| Land Area | 71.6 | 1.6 | 3,531,905.4 |
| Water Area | 1.1 | 0.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mountain, WI | Belhaven, NC | United States |
| Age 0 to 4 | 2.6% | 3.1% | 5.9% |
| Age 5 to 9 | 7.0% | 5.8% | 6.1% |
| Age 10 to 14 | 5.7% | 13.9% | 6.6% |
| Age 15 to 17 | 2.4% | 3.4% | 3.9% |
| Age 18 to 20 | 2.3% | 1.5% | 4.0% |
| Age 21 to 24 | 2.6% | 3.3% | 5.2% |
| Age 25 to 34 | 4.7% | 8.5% | 13.8% |
| Age 35 to 44 | 10.2% | 9.5% | 12.9% |
| Age 45 to 54 | 10.3% | 13.1% | 12.6% |
| Age 55 to 59 | 9.7% | 7.7% | 6.7% |
| Age 60 to 64 | 14.7% | 7.0% | 6.3% |
| Age 65 to 74 | 20.8% | 14.4% | 9.6% |
| Age 75 to 84 | 3.7% | 5.9% | 4.5% |
| Age 85 and over | 3.5% | 2.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mountain, WI | Belhaven, NC | United States |
| White | 97.8% | 34.9% | 59.4% |
| Black | 0.0% | 51.3% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 1.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 0.2% | 3.2% |
| Hispanic | 1.0% | 13.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mountain, WI | Belhaven, NC | United States |
| Married Population | 51.9% | 32.8% | 49.8% |
| Currently Married | 50.2% | 29.5% | 48.0% |
| Married but Separated | 1.7% | 3.2% | 1.8% |
| Single Population | 48.1% | 67.2% | 50.2% |
| Never Married | 20.6% | 40.6% | 33.8% |
| Divorced | 14.2% | 12.9% | 10.8% |
| Widowed | 13.2% | 13.7% | 5.6% |
| space5 | | | |
| Household Size | 1.97 | 2.46 | 2.60 |
| Households | 493 | 568 | 124,010,992 |
| Family Households | 288 | 269 | 80,755,759 |
| Married couple, w/children | 11.8% | 13.8% | 30.5% |
| Married couple, no children | 66.0% | 34.2% | 42.9% |
| Non Family Households | 205 | 299 | 43,255,233 |
| Single householder, w/children | 13.9% | 37.2% | 15.8% |
| Single householder, no children | 8.3% | 14.9% | 10.8% |