| | Hankinson, ND | Sidney, MT | United States |
| Population | 839 | 6,240 | 329,725,481 |
| Female Population | 46.7% | 51.4% | 50.5% |
| Male Population | 53.3% | 48.6% | 49.5% |
| Median Age | 36.9 | 38.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 918 | 5,331 | 309,327,143 |
| Population - 2000 | 1,058 | 4,774 | 285,036,114 |
| Population - 1990 | 1,038 | 5,217 | 251,960,433 |
| Pop. 2000 to Now | -16.8% | 31.9% | 15.6% |
| Pop. 1990 to Now | -15.2% | 20.7% | 30.8% |
| space4 | | | |
| Population Density | 451.6 | 1,897.2 | 93.4 |
| Land Area | 1.9 | 3.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hankinson, ND | Sidney, MT | United States |
| Age 0 to 4 | 7.7% | 6.0% | 5.9% |
| Age 5 to 9 | 8.6% | 6.0% | 6.1% |
| Age 10 to 14 | 9.3% | 8.6% | 6.6% |
| Age 15 to 17 | 3.1% | 4.4% | 3.9% |
| Age 18 to 20 | 0.4% | 5.3% | 4.0% |
| Age 21 to 24 | 1.4% | 2.9% | 5.2% |
| Age 25 to 34 | 15.5% | 14.1% | 13.8% |
| Age 35 to 44 | 14.5% | 13.8% | 12.9% |
| Age 45 to 54 | 6.7% | 12.2% | 12.6% |
| Age 55 to 59 | 1.8% | 5.8% | 6.7% |
| Age 60 to 64 | 3.9% | 7.3% | 6.3% |
| Age 65 to 74 | 12.8% | 9.5% | 9.6% |
| Age 75 to 84 | 7.0% | 2.6% | 4.5% |
| Age 85 and over | 7.3% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hankinson, ND | Sidney, MT | United States |
| White | 85.8% | 84.0% | 59.4% |
| Black | 0.4% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.8% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.9% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.7% | 7.0% | 3.2% |
| Hispanic | 12.3% | 6.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hankinson, ND | Sidney, MT | United States |
| Married Population | 55.0% | 49.9% | 49.8% |
| Currently Married | 55.0% | 48.3% | 48.0% |
| Married but Separated | 0.0% | 1.7% | 1.8% |
| Single Population | 45.0% | 50.1% | 50.2% |
| Never Married | 26.6% | 28.7% | 33.8% |
| Divorced | 6.4% | 13.1% | 10.8% |
| Widowed | 12.0% | 8.3% | 5.6% |
| space5 | | | |
| Household Size | 2.43 | 2.48 | 2.60 |
| Households | 322 | 2,502 | 124,010,992 |
| Family Households | 198 | 1,469 | 80,755,759 |
| Married couple, w/children | 39.9% | 28.2% | 30.5% |
| Married couple, no children | 38.9% | 48.0% | 42.9% |
| Non Family Households | 124 | 1,033 | 43,255,233 |
| Single householder, w/children | 11.6% | 15.4% | 15.8% |
| Single householder, no children | 9.6% | 8.4% | 10.8% |