| | Armour, SD | Ord, NE | United States |
| Population | 719 | 2,049 | 329,725,481 |
| Female Population | 51.7% | 49.1% | 50.5% |
| Male Population | 48.3% | 51.0% | 49.5% |
| Median Age | 44.8 | 42.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 696 | 2,150 | 309,327,143 |
| Population - 2000 | 782 | 2,269 | 285,036,114 |
| Population - 1990 | 854 | 2,481 | 251,960,433 |
| Pop. 2000 to Now | -14.8% | -9.6% | 15.6% |
| Pop. 1990 to Now | -22.0% | -17.3% | 30.8% |
| space4 | | | |
| Population Density | 761.7 | 975.3 | 93.4 |
| Land Area | 0.9 | 2.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Armour, SD | Ord, NE | United States |
| Age 0 to 4 | 9.5% | 7.5% | 5.9% |
| Age 5 to 9 | 7.0% | 6.5% | 6.1% |
| Age 10 to 14 | 8.5% | 5.6% | 6.6% |
| Age 15 to 17 | 4.5% | 2.0% | 3.9% |
| Age 18 to 20 | 0.1% | 4.0% | 4.0% |
| Age 21 to 24 | 2.4% | 2.2% | 5.2% |
| Age 25 to 34 | 12.0% | 11.4% | 13.8% |
| Age 35 to 44 | 6.4% | 11.6% | 12.9% |
| Age 45 to 54 | 8.9% | 9.5% | 12.6% |
| Age 55 to 59 | 8.8% | 6.9% | 6.7% |
| Age 60 to 64 | 4.3% | 7.2% | 6.3% |
| Age 65 to 74 | 10.8% | 13.0% | 9.6% |
| Age 75 to 84 | 7.8% | 10.2% | 4.5% |
| Age 85 and over | 9.2% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Armour, SD | Ord, NE | United States |
| White | 87.1% | 95.7% | 59.4% |
| Black | 5.8% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 1.3% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 3.9% | 1.2% | 3.2% |
| Hispanic | 1.7% | 2.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Armour, SD | Ord, NE | United States |
| Married Population | 63.0% | 58.4% | 49.8% |
| Currently Married | 60.4% | 58.1% | 48.0% |
| Married but Separated | 2.6% | 0.4% | 1.8% |
| Single Population | 37.0% | 41.6% | 50.2% |
| Never Married | 14.8% | 24.1% | 33.8% |
| Divorced | 8.3% | 9.4% | 10.8% |
| Widowed | 13.9% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 2.34 | 2.15 | 2.60 |
| Households | 290 | 922 | 124,010,992 |
| Family Households | 183 | 573 | 80,755,759 |
| Married couple, w/children | 40.4% | 25.7% | 30.5% |
| Married couple, no children | 47.5% | 56.9% | 42.9% |
| Non Family Households | 107 | 349 | 43,255,233 |
| Single householder, w/children | 9.3% | 14.0% | 15.8% |
| Single householder, no children | 2.7% | 3.5% | 10.8% |