| | Fairmount, IN | Vincennes, IN | United States |
| Population | 2,638 | 16,892 | 329,725,481 |
| Female Population | 48.4% | 49.8% | 50.5% |
| Male Population | 51.6% | 50.2% | 49.5% |
| Median Age | 38.3 | 38 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,945 | 18,393 | 309,327,143 |
| Population - 2000 | 2,992 | 18,701 | 285,036,114 |
| Population - 1990 | 3,130 | 19,859 | 251,960,433 |
| Pop. 2000 to Now | -8.4% | -10.2% | 15.6% |
| Pop. 1990 to Now | -12.4% | -15.4% | 30.8% |
| space4 | | | |
| Population Density | 1,663.3 | 2,279.6 | 93.4 |
| Land Area | 1.6 | 7.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fairmount, IN | Vincennes, IN | United States |
| Age 0 to 4 | 7.8% | 6.1% | 5.9% |
| Age 5 to 9 | 8.1% | 6.6% | 6.1% |
| Age 10 to 14 | 7.6% | 3.0% | 6.6% |
| Age 15 to 17 | 1.6% | 3.3% | 3.9% |
| Age 18 to 20 | 3.3% | 10.6% | 4.0% |
| Age 21 to 24 | 2.5% | 6.2% | 5.2% |
| Age 25 to 34 | 15.1% | 11.2% | 13.8% |
| Age 35 to 44 | 9.9% | 11.5% | 12.9% |
| Age 45 to 54 | 9.1% | 12.5% | 12.6% |
| Age 55 to 59 | 9.6% | 6.0% | 6.7% |
| Age 60 to 64 | 8.1% | 6.9% | 6.3% |
| Age 65 to 74 | 10.2% | 8.7% | 9.6% |
| Age 75 to 84 | 6.4% | 5.5% | 4.5% |
| Age 85 and over | 0.8% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fairmount, IN | Vincennes, IN | United States |
| White | 94.5% | 85.5% | 59.4% |
| Black | 0.0% | 5.1% | 12.2% |
| Asian | 0.0% | 1.2% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.0% | 4.0% | 3.2% |
| Hispanic | 2.5% | 4.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fairmount, IN | Vincennes, IN | United States |
| Married Population | 44.7% | 42.8% | 49.8% |
| Currently Married | 37.8% | 41.9% | 48.0% |
| Married but Separated | 6.9% | 0.9% | 1.8% |
| Single Population | 55.3% | 57.2% | 50.2% |
| Never Married | 32.1% | 37.3% | 33.8% |
| Divorced | 14.5% | 11.8% | 10.8% |
| Widowed | 8.7% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 2.09 | 2.60 |
| Households | 1,081 | 7,398 | 124,010,992 |
| Family Households | 715 | 4,235 | 80,755,759 |
| Married couple, w/children | 17.1% | 24.1% | 30.5% |
| Married couple, no children | 35.8% | 41.0% | 42.9% |
| Non Family Households | 366 | 3,163 | 43,255,233 |
| Single householder, w/children | 30.6% | 27.0% | 15.8% |
| Single householder, no children | 16.5% | 7.9% | 10.8% |