| | Preston, NY | Decatur, NY | United States |
| Population | 1,103 | 329 | 329,725,481 |
| Female Population | 47.0% | 42.9% | 50.5% |
| Male Population | 53.0% | 57.1% | 49.5% |
| Median Age | 45.4 | 50.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,034 | 353 | 309,327,143 |
| Population - 2000 | 928 | 410 | 285,036,114 |
| Population - 1990 | 1,100 | 356 | 251,960,433 |
| Pop. 2000 to Now | 5.1% | -19.3% | 15.6% |
| Pop. 1990 to Now | -11.4% | -7.0% | 30.8% |
| space4 | | | |
| Population Density | 31.6 | 16.0 | 93.4 |
| Land Area | 34.9 | 20.6 | 3,531,905.4 |
| Water Area | 0.2 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Preston, NY | Decatur, NY | United States |
| Age 0 to 4 | 4.7% | 2.1% | 5.9% |
| Age 5 to 9 | 4.9% | 1.8% | 6.1% |
| Age 10 to 14 | 3.9% | 7.6% | 6.6% |
| Age 15 to 17 | 2.5% | 3.0% | 3.9% |
| Age 18 to 20 | 1.8% | 2.7% | 4.0% |
| Age 21 to 24 | 5.0% | 2.7% | 5.2% |
| Age 25 to 34 | 14.4% | 14.6% | 13.8% |
| Age 35 to 44 | 11.2% | 9.1% | 12.9% |
| Age 45 to 54 | 14.2% | 10.3% | 12.6% |
| Age 55 to 59 | 8.6% | 11.2% | 6.7% |
| Age 60 to 64 | 9.5% | 8.8% | 6.3% |
| Age 65 to 74 | 12.1% | 13.1% | 9.6% |
| Age 75 to 84 | 5.1% | 6.7% | 4.5% |
| Age 85 and over | 2.0% | 6.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Preston, NY | Decatur, NY | United States |
| White | 96.3% | 93.0% | 59.4% |
| Black | 0.2% | 2.4% | 12.2% |
| Asian | 0.9% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.4% | 2.7% | 3.2% |
| Hispanic | 0.3% | 1.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Preston, NY | Decatur, NY | United States |
| Married Population | 60.3% | 56.4% | 49.8% |
| Currently Married | 58.0% | 55.3% | 48.0% |
| Married but Separated | 2.3% | 1.0% | 1.8% |
| Single Population | 39.7% | 43.6% | 50.2% |
| Never Married | 22.0% | 28.5% | 33.8% |
| Divorced | 12.0% | 8.6% | 10.8% |
| Widowed | 5.8% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.51 | 2.67 | 2.60 |
| Households | 439 | 123 | 124,010,992 |
| Family Households | 323 | 94 | 80,755,759 |
| Married couple, w/children | 22.3% | 26.6% | 30.5% |
| Married couple, no children | 59.8% | 58.5% | 42.9% |
| Non Family Households | 116 | 29 | 43,255,233 |
| Single householder, w/children | 9.6% | 4.3% | 15.8% |
| Single householder, no children | 8.4% | 10.6% | 10.8% |