| | Lyndonville, NY | Marilla, NY | United States |
| Population | 774 | 5,203 | 329,725,481 |
| Female Population | 50.1% | 44.8% | 50.5% |
| Male Population | 49.9% | 55.2% | 49.5% |
| Median Age | 37.6 | 46.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 838 | 5,332 | 309,327,143 |
| Population - 2000 | 862 | 5,709 | 285,036,114 |
| Population - 1990 | 953 | 5,250 | 251,960,433 |
| Pop. 2000 to Now | -10.6% | -5.8% | 15.6% |
| Pop. 1990 to Now | -19.1% | 2.4% | 30.8% |
| space4 | | | |
| Population Density | 755.9 | 189.2 | 93.4 |
| Land Area | 1.0 | 27.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lyndonville, NY | Marilla, NY | United States |
| Age 0 to 4 | 7.1% | 3.1% | 5.9% |
| Age 5 to 9 | 7.8% | 4.3% | 6.1% |
| Age 10 to 14 | 8.1% | 4.3% | 6.6% |
| Age 15 to 17 | 4.4% | 3.9% | 3.9% |
| Age 18 to 20 | 3.5% | 3.4% | 4.0% |
| Age 21 to 24 | 6.7% | 5.6% | 5.2% |
| Age 25 to 34 | 8.7% | 10.1% | 13.8% |
| Age 35 to 44 | 14.0% | 12.6% | 12.9% |
| Age 45 to 54 | 10.7% | 18.9% | 12.6% |
| Age 55 to 59 | 8.9% | 9.3% | 6.7% |
| Age 60 to 64 | 8.9% | 7.4% | 6.3% |
| Age 65 to 74 | 6.3% | 10.0% | 9.6% |
| Age 75 to 84 | 3.7% | 5.0% | 4.5% |
| Age 85 and over | 1.2% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lyndonville, NY | Marilla, NY | United States |
| White | 92.6% | 93.6% | 59.4% |
| Black | 0.5% | 0.0% | 12.2% |
| Asian | 0.0% | 0.9% | 5.6% |
| Native American | 0.0% | 0.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 3.2% | 0.5% | 3.2% |
| Hispanic | 3.2% | 4.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lyndonville, NY | Marilla, NY | United States |
| Married Population | 46.6% | 63.7% | 49.8% |
| Currently Married | 41.4% | 63.4% | 48.0% |
| Married but Separated | 5.2% | 0.3% | 1.8% |
| Single Population | 53.4% | 36.3% | 50.2% |
| Never Married | 33.1% | 25.0% | 33.8% |
| Divorced | 16.4% | 6.3% | 10.8% |
| Widowed | 3.9% | 5.0% | 5.6% |
| space5 | | | |
| Household Size | 2.43 | 2.54 | 2.60 |
| Households | 318 | 2,051 | 124,010,992 |
| Family Households | 226 | 1,462 | 80,755,759 |
| Married couple, w/children | 21.7% | 26.6% | 30.5% |
| Married couple, no children | 31.4% | 67.8% | 42.9% |
| Non Family Households | 92 | 589 | 43,255,233 |
| Single householder, w/children | 33.2% | 3.7% | 15.8% |
| Single householder, no children | 13.7% | 1.9% | 10.8% |