| | New Castle, IN | Vincennes, IN | United States |
| Population | 17,465 | 16,892 | 329,725,481 |
| Female Population | 50.0% | 49.8% | 50.5% |
| Male Population | 50.0% | 50.2% | 49.5% |
| Median Age | 40.5 | 38 | 38.4 |
| space3 | | | |
| Population - 2010 | 18,125 | 18,393 | 309,327,143 |
| Population - 2000 | 17,780 | 18,701 | 285,036,114 |
| Population - 1990 | 17,753 | 19,859 | 251,960,433 |
| Pop. 2000 to Now | -3.8% | -10.2% | 15.6% |
| Pop. 1990 to Now | -3.6% | -15.4% | 30.8% |
| space4 | | | |
| Population Density | 2,374.6 | 2,279.6 | 93.4 |
| Land Area | 7.4 | 7.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | New Castle, IN | Vincennes, IN | United States |
| Age 0 to 4 | 5.3% | 6.1% | 5.9% |
| Age 5 to 9 | 7.3% | 6.6% | 6.1% |
| Age 10 to 14 | 5.2% | 3.0% | 6.6% |
| Age 15 to 17 | 4.4% | 3.3% | 3.9% |
| Age 18 to 20 | 3.1% | 10.6% | 4.0% |
| Age 21 to 24 | 6.6% | 6.2% | 5.2% |
| Age 25 to 34 | 11.5% | 11.2% | 13.8% |
| Age 35 to 44 | 11.9% | 11.5% | 12.9% |
| Age 45 to 54 | 13.3% | 12.5% | 12.6% |
| Age 55 to 59 | 7.0% | 6.0% | 6.7% |
| Age 60 to 64 | 7.3% | 6.9% | 6.3% |
| Age 65 to 74 | 10.0% | 8.7% | 9.6% |
| Age 75 to 84 | 5.1% | 5.5% | 4.5% |
| Age 85 and over | 2.0% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | New Castle, IN | Vincennes, IN | United States |
| White | 91.8% | 85.5% | 59.4% |
| Black | 2.8% | 5.1% | 12.2% |
| Asian | 0.5% | 1.2% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 2.9% | 4.0% | 3.2% |
| Hispanic | 1.6% | 4.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | New Castle, IN | Vincennes, IN | United States |
| Married Population | 45.0% | 42.8% | 49.8% |
| Currently Married | 42.9% | 41.9% | 48.0% |
| Married but Separated | 2.1% | 0.9% | 1.8% |
| Single Population | 55.0% | 57.2% | 50.2% |
| Never Married | 31.6% | 37.3% | 33.8% |
| Divorced | 16.2% | 11.8% | 10.8% |
| Widowed | 7.2% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 2.37 | 2.09 | 2.60 |
| Households | 7,179 | 7,398 | 124,010,992 |
| Family Households | 4,353 | 4,235 | 80,755,759 |
| Married couple, w/children | 25.7% | 24.1% | 30.5% |
| Married couple, no children | 40.5% | 41.0% | 42.9% |
| Non Family Households | 2,826 | 3,163 | 43,255,233 |
| Single householder, w/children | 19.8% | 27.0% | 15.8% |
| Single householder, no children | 14.0% | 7.9% | 10.8% |