| | St. Helen, MI | Arkadelphia, AR | United States |
| Population | 2,791 | 10,332 | 329,725,481 |
| Female Population | 50.8% | 52.0% | 50.5% |
| Male Population | 49.2% | 48.0% | 49.5% |
| Median Age | 58.3 | 24.5 | 38.4 |
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| Population - 2010 | 2,706 | 10,676 | 309,327,143 |
| Population - 2000 | 2,993 | 10,912 | 285,036,114 |
| Population - 1990 | 2,390 | 10,014 | 251,960,433 |
| Pop. 2000 to Now | -6.6% | -2.6% | 15.6% |
| Pop. 1990 to Now | 17.0% | 6.1% | 30.8% |
| space4 | | | |
| Population Density | 554.5 | 1,456.2 | 93.4 |
| Land Area | 5.0 | 7.1 | 3,531,905.4 |
| Water Area | 0.9 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Helen, MI | Arkadelphia, AR | United States |
| Age 0 to 4 | 3.9% | 5.4% | 5.9% |
| Age 5 to 9 | 3.4% | 2.7% | 6.1% |
| Age 10 to 14 | 1.3% | 6.0% | 6.6% |
| Age 15 to 17 | 2.0% | 3.1% | 3.9% |
| Age 18 to 20 | 2.2% | 19.2% | 4.0% |
| Age 21 to 24 | 2.0% | 15.0% | 5.2% |
| Age 25 to 34 | 10.8% | 11.7% | 13.8% |
| Age 35 to 44 | 6.4% | 8.1% | 12.9% |
| Age 45 to 54 | 12.6% | 7.3% | 12.6% |
| Age 55 to 59 | 9.4% | 3.8% | 6.7% |
| Age 60 to 64 | 13.0% | 4.4% | 6.3% |
| Age 65 to 74 | 18.8% | 7.5% | 9.6% |
| Age 75 to 84 | 11.7% | 3.8% | 4.5% |
| Age 85 and over | 2.5% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Helen, MI | Arkadelphia, AR | United States |
| White | 93.1% | 58.2% | 59.4% |
| Black | 0.0% | 32.3% | 12.2% |
| Asian | 0.3% | 1.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.6% | 2.5% | 3.2% |
| Hispanic | 2.9% | 5.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | St. Helen, MI | Arkadelphia, AR | United States |
| Married Population | 37.1% | 29.7% | 49.8% |
| Currently Married | 36.1% | 27.0% | 48.0% |
| Married but Separated | 1.1% | 2.8% | 1.8% |
| Single Population | 62.9% | 70.3% | 50.2% |
| Never Married | 27.8% | 55.4% | 33.8% |
| Divorced | 24.8% | 7.2% | 10.8% |
| Widowed | 10.2% | 7.7% | 5.6% |
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| Household Size | 2.04 | 2.21 | 2.60 |
| Households | 1,366 | 3,684 | 124,010,992 |
| Family Households | 702 | 1,785 | 80,755,759 |
| Married couple, w/children | 10.1% | 23.9% | 30.5% |
| Married couple, no children | 52.6% | 36.6% | 42.9% |
| Non Family Households | 664 | 1,899 | 43,255,233 |
| Single householder, w/children | 17.8% | 21.2% | 15.8% |
| Single householder, no children | 19.5% | 18.3% | 10.8% |