| | Nappanee, IN | Knox, IN | United States |
| Population | 7,132 | 3,691 | 329,725,481 |
| Female Population | 50.5% | 51.2% | 50.5% |
| Male Population | 49.5% | 48.8% | 49.5% |
| Median Age | 34 | 41.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,658 | 3,700 | 309,327,143 |
| Population - 2000 | 6,710 | 3,721 | 285,036,114 |
| Population - 1990 | 5,510 | 3,705 | 251,960,433 |
| Pop. 2000 to Now | 2.0% | -4.5% | 15.6% |
| Pop. 1990 to Now | 24.2% | -4.1% | 30.8% |
| space4 | | | |
| Population Density | 1,612.5 | 941.6 | 93.4 |
| Land Area | 4.4 | 3.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Nappanee, IN | Knox, IN | United States |
| Age 0 to 4 | 6.2% | 5.5% | 5.9% |
| Age 5 to 9 | 5.8% | 8.2% | 6.1% |
| Age 10 to 14 | 8.4% | 8.4% | 6.6% |
| Age 15 to 17 | 2.9% | 4.4% | 3.9% |
| Age 18 to 20 | 2.7% | 4.0% | 4.0% |
| Age 21 to 24 | 4.4% | 3.0% | 5.2% |
| Age 25 to 34 | 21.2% | 9.6% | 13.8% |
| Age 35 to 44 | 11.7% | 12.4% | 12.9% |
| Age 45 to 54 | 11.9% | 18.2% | 12.6% |
| Age 55 to 59 | 7.9% | 6.3% | 6.7% |
| Age 60 to 64 | 4.8% | 4.5% | 6.3% |
| Age 65 to 74 | 6.5% | 10.5% | 9.6% |
| Age 75 to 84 | 4.1% | 2.9% | 4.5% |
| Age 85 and over | 1.4% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Nappanee, IN | Knox, IN | United States |
| White | 83.1% | 89.9% | 59.4% |
| Black | 0.3% | 0.1% | 12.2% |
| Asian | 1.4% | 0.3% | 5.6% |
| Native American | 0.0% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 4.2% | 3.2% |
| Hispanic | 13.9% | 5.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Nappanee, IN | Knox, IN | United States |
| Married Population | 59.5% | 44.7% | 49.8% |
| Currently Married | 57.2% | 43.0% | 48.0% |
| Married but Separated | 2.3% | 1.7% | 1.8% |
| Single Population | 40.5% | 55.3% | 50.2% |
| Never Married | 22.8% | 24.5% | 33.8% |
| Divorced | 12.7% | 24.2% | 10.8% |
| Widowed | 5.0% | 6.6% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 2.67 | 2.60 |
| Households | 2,741 | 1,373 | 124,010,992 |
| Family Households | 1,887 | 807 | 80,755,759 |
| Married couple, w/children | 27.1% | 32.8% | 30.5% |
| Married couple, no children | 51.2% | 38.9% | 42.9% |
| Non Family Households | 854 | 566 | 43,255,233 |
| Single householder, w/children | 13.8% | 20.2% | 15.8% |
| Single householder, no children | 7.8% | 8.1% | 10.8% |