| | Richardton, ND | Marsing, ID | United States |
| Population | 896 | 1,275 | 329,725,481 |
| Female Population | 54.7% | 50.0% | 50.5% |
| Male Population | 45.3% | 50.0% | 49.5% |
| Median Age | 38.1 | 45.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 527 | 1,292 | 309,327,143 |
| Population - 2000 | 619 | 890 | 285,036,114 |
| Population - 1990 | 625 | 798 | 251,960,433 |
| Pop. 2000 to Now | -7.4% | 52.3% | 15.6% |
| Pop. 1990 to Now | -8.3% | 69.8% | 30.8% |
| space4 | | | |
| Population Density | 655.0 | 1,869.5 | 93.4 |
| Land Area | 1.4 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Richardton, ND | Marsing, ID | United States |
| Age 0 to 4 | 5.5% | 3.3% | 5.9% |
| Age 5 to 9 | 6.5% | 8.1% | 6.1% |
| Age 10 to 14 | 13.7% | 7.1% | 6.6% |
| Age 15 to 17 | 6.9% | 5.6% | 3.9% |
| Age 18 to 20 | 2.5% | 2.4% | 4.0% |
| Age 21 to 24 | 0.2% | 2.7% | 5.2% |
| Age 25 to 34 | 8.6% | 6.0% | 13.8% |
| Age 35 to 44 | 12.4% | 10.7% | 12.9% |
| Age 45 to 54 | 11.6% | 21.6% | 12.6% |
| Age 55 to 59 | 12.2% | 8.9% | 6.7% |
| Age 60 to 64 | 5.5% | 3.1% | 6.3% |
| Age 65 to 74 | 9.4% | 11.1% | 9.6% |
| Age 75 to 84 | 3.5% | 8.8% | 4.5% |
| Age 85 and over | 1.7% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Richardton, ND | Marsing, ID | United States |
| White | 88.6% | 41.4% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.6% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.1% | 0.0% | 0.4% |
| Two or More Races | 5.7% | 0.5% | 3.2% |
| Hispanic | 3.8% | 58.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Richardton, ND | Marsing, ID | United States |
| Married Population | 51.5% | 50.8% | 49.8% |
| Currently Married | 51.2% | 49.0% | 48.0% |
| Married but Separated | 0.3% | 1.7% | 1.8% |
| Single Population | 48.5% | 49.2% | 50.2% |
| Never Married | 26.6% | 28.6% | 33.8% |
| Divorced | 18.9% | 17.6% | 10.8% |
| Widowed | 3.0% | 3.1% | 5.6% |
| space5 | | | |
| Household Size | 2.49 | 2.57 | 2.60 |
| Households | 360 | 497 | 124,010,992 |
| Family Households | 264 | 345 | 80,755,759 |
| Married couple, w/children | 24.6% | 29.0% | 30.5% |
| Married couple, no children | 37.9% | 30.7% | 42.9% |
| Non Family Households | 96 | 152 | 43,255,233 |
| Single householder, w/children | 36.7% | 11.9% | 15.8% |
| Single householder, no children | 0.8% | 28.4% | 10.8% |