| | Tappen, ND | Napoleon, ND | United States |
| Population | 269 | 794 | 329,725,481 |
| Female Population | 43.1% | 51.9% | 50.5% |
| Male Population | 56.9% | 48.1% | 49.5% |
| Median Age | 43.9 | 48 | 38.4 |
| space3 | | | |
| Population - 2010 | 198 | 797 | 309,327,143 |
| Population - 2000 | 210 | 857 | 285,036,114 |
| Population - 1990 | 239 | 930 | 251,960,433 |
| Pop. 2000 to Now | -2.4% | -11.3% | 15.6% |
| Pop. 1990 to Now | -14.2% | -18.3% | 30.8% |
| space4 | | | |
| Population Density | 256.4 | 574.1 | 93.4 |
| Land Area | 1.0 | 1.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Tappen, ND | Napoleon, ND | United States |
| Age 0 to 4 | 5.6% | 6.0% | 5.9% |
| Age 5 to 9 | 3.7% | 3.5% | 6.1% |
| Age 10 to 14 | 5.2% | 4.7% | 6.6% |
| Age 15 to 17 | 14.1% | 6.4% | 3.9% |
| Age 18 to 20 | 5.6% | 3.0% | 4.0% |
| Age 21 to 24 | 1.9% | 4.2% | 5.2% |
| Age 25 to 34 | 7.8% | 12.1% | 13.8% |
| Age 35 to 44 | 7.8% | 8.9% | 12.9% |
| Age 45 to 54 | 19.7% | 6.9% | 12.6% |
| Age 55 to 59 | 8.6% | 7.1% | 6.7% |
| Age 60 to 64 | 7.8% | 9.1% | 6.3% |
| Age 65 to 74 | 4.8% | 11.5% | 9.6% |
| Age 75 to 84 | 6.3% | 10.5% | 4.5% |
| Age 85 and over | 1.1% | 6.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Tappen, ND | Napoleon, ND | United States |
| White | 81.4% | 99.5% | 59.4% |
| Black | 2.2% | 0.0% | 12.2% |
| Asian | 0.0% | 0.1% | 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 | 9.7% | 0.4% | 3.2% |
| Hispanic | 6.7% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Tappen, ND | Napoleon, ND | United States |
| Married Population | 46.1% | 60.6% | 49.8% |
| Currently Married | 43.5% | 60.6% | 48.0% |
| Married but Separated | 2.6% | 0.0% | 1.8% |
| Single Population | 53.9% | 39.4% | 50.2% |
| Never Married | 43.0% | 24.7% | 33.8% |
| Divorced | 7.0% | 6.6% | 10.8% |
| Widowed | 3.9% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 2.86 | 2.15 | 2.60 |
| Households | 94 | 352 | 124,010,992 |
| Family Households | 74 | 213 | 80,755,759 |
| Married couple, w/children | 29.7% | 25.8% | 30.5% |
| Married couple, no children | 36.5% | 63.9% | 42.9% |
| Non Family Households | 20 | 139 | 43,255,233 |
| Single householder, w/children | 21.6% | 4.2% | 15.8% |
| Single householder, no children | 12.2% | 6.1% | 10.8% |