| | Fort Montgomery, NY | Beacon, NY | United States |
| Population | 1,790 | 13,713 | 329,725,481 |
| Female Population | 45.0% | 51.4% | 50.5% |
| Male Population | 55.0% | 48.6% | 49.5% |
| Median Age | 45.4 | 40 | 38.4 |
| space3 | | | |
| Population - 2010 | 854 | 13,838 | 309,327,143 |
| Population - 2000 | 1,418 | 13,808 | 285,036,114 |
| Population - 1990 | 1,450 | 13,243 | 251,960,433 |
| Pop. 2000 to Now | 17.3% | 0.9% | 15.6% |
| Pop. 1990 to Now | 14.7% | 5.2% | 30.8% |
| space4 | | | |
| Population Density | 1,215.2 | 2,893.7 | 93.4 |
| Land Area | 1.5 | 4.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fort Montgomery, NY | Beacon, NY | United States |
| Age 0 to 4 | 5.9% | 5.0% | 5.9% |
| Age 5 to 9 | 4.1% | 5.7% | 6.1% |
| Age 10 to 14 | 5.6% | 6.0% | 6.6% |
| Age 15 to 17 | 6.3% | 5.1% | 3.9% |
| Age 18 to 20 | 3.4% | 2.7% | 4.0% |
| Age 21 to 24 | 2.7% | 4.5% | 5.2% |
| Age 25 to 34 | 7.9% | 13.7% | 13.8% |
| Age 35 to 44 | 12.6% | 14.3% | 12.9% |
| Age 45 to 54 | 15.1% | 14.7% | 12.6% |
| Age 55 to 59 | 10.2% | 6.4% | 6.7% |
| Age 60 to 64 | 6.9% | 7.9% | 6.3% |
| Age 65 to 74 | 15.6% | 8.0% | 9.6% |
| Age 75 to 84 | 1.3% | 3.4% | 4.5% |
| Age 85 and over | 2.5% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fort Montgomery, NY | Beacon, NY | United States |
| White | 55.1% | 61.5% | 59.4% |
| Black | 7.7% | 12.8% | 12.2% |
| Asian | 9.1% | 3.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 0.7% | 3.0% | 3.2% |
| Hispanic | 27.4% | 19.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fort Montgomery, NY | Beacon, NY | United States |
| Married Population | 54.1% | 47.3% | 49.8% |
| Currently Married | 51.5% | 45.1% | 48.0% |
| Married but Separated | 2.6% | 2.2% | 1.8% |
| Single Population | 45.9% | 52.7% | 50.2% |
| Never Married | 31.9% | 37.9% | 33.8% |
| Divorced | 9.7% | 9.9% | 10.8% |
| Widowed | 4.4% | 4.8% | 5.6% |
| space5 | | | |
| Household Size | 2.66 | 2.42 | 2.60 |
| Households | 674 | 5,577 | 124,010,992 |
| Family Households | 405 | 3,274 | 80,755,759 |
| Married couple, w/children | 38.3% | 29.8% | 30.5% |
| Married couple, no children | 50.1% | 45.0% | 42.9% |
| Non Family Households | 269 | 2,303 | 43,255,233 |
| Single householder, w/children | 2.5% | 18.1% | 15.8% |
| Single householder, no children | 9.1% | 7.1% | 10.8% |