| | Huntingdon, PA | Mobridge, SD | United States |
| Population | 6,851 | 3,215 | 329,725,481 |
| Female Population | 52.8% | 52.8% | 50.5% |
| Male Population | 47.2% | 47.3% | 49.5% |
| Median Age | 36 | 41.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,089 | 3,465 | 309,327,143 |
| Population - 2000 | 6,918 | 3,574 | 285,036,114 |
| Population - 1990 | 6,843 | 3,768 | 251,960,433 |
| Pop. 2000 to Now | -0.6% | -5.6% | 15.6% |
| Pop. 1990 to Now | 0.5% | -10.5% | 30.8% |
| space4 | | | |
| Population Density | 1,894.1 | 1,664.1 | 93.4 |
| Land Area | 3.6 | 1.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Huntingdon, PA | Mobridge, SD | United States |
| Age 0 to 4 | 4.4% | 6.3% | 5.9% |
| Age 5 to 9 | 4.1% | 5.4% | 6.1% |
| Age 10 to 14 | 4.7% | 8.5% | 6.6% |
| Age 15 to 17 | 2.1% | 2.2% | 3.9% |
| Age 18 to 20 | 13.4% | 2.8% | 4.0% |
| Age 21 to 24 | 9.8% | 3.7% | 5.2% |
| Age 25 to 34 | 10.2% | 11.0% | 13.8% |
| Age 35 to 44 | 9.3% | 14.5% | 12.9% |
| Age 45 to 54 | 12.6% | 6.9% | 12.6% |
| Age 55 to 59 | 5.4% | 7.4% | 6.7% |
| Age 60 to 64 | 6.7% | 9.2% | 6.3% |
| Age 65 to 74 | 11.7% | 11.0% | 9.6% |
| Age 75 to 84 | 3.6% | 8.7% | 4.5% |
| Age 85 and over | 2.0% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Huntingdon, PA | Mobridge, SD | United States |
| White | 89.0% | 69.0% | 59.4% |
| Black | 1.7% | 6.1% | 12.2% |
| Asian | 0.7% | 0.3% | 5.6% |
| Native American | 0.5% | 18.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 6.8% | 4.4% | 3.2% |
| Hispanic | 1.4% | 1.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Huntingdon, PA | Mobridge, SD | United States |
| Married Population | 36.4% | 46.2% | 49.8% |
| Currently Married | 35.5% | 42.5% | 48.0% |
| Married but Separated | 1.0% | 3.7% | 1.8% |
| Single Population | 63.6% | 53.8% | 50.2% |
| Never Married | 42.4% | 29.9% | 33.8% |
| Divorced | 13.5% | 15.3% | 10.8% |
| Widowed | 7.7% | 8.6% | 5.6% |
| space5 | | | |
| Household Size | 2.30 | 2.06 | 2.60 |
| Households | 2,387 | 1,462 | 124,010,992 |
| Family Households | 1,432 | 817 | 80,755,759 |
| Married couple, w/children | 21.2% | 21.1% | 30.5% |
| Married couple, no children | 45.0% | 43.7% | 42.9% |
| Non Family Households | 955 | 645 | 43,255,233 |
| Single householder, w/children | 23.3% | 18.0% | 15.8% |
| Single householder, no children | 10.4% | 17.3% | 10.8% |