| | St. Paul, AR | Mountainburg, AR | United States |
| Population | 106 | 528 | 329,725,481 |
| Female Population | 48.1% | 50.4% | 50.5% |
| Male Population | 51.9% | 49.6% | 49.5% |
| Median Age | 46 | 40.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 95 | 621 | 309,327,143 |
| Population - 2000 | 163 | 682 | 285,036,114 |
| Population - 1990 | 88 | 488 | 251,960,433 |
| Pop. 2000 to Now | -32.5% | -10.3% | 15.6% |
| Pop. 1990 to Now | 25.0% | 25.4% | 30.8% |
| space4 | | | |
| Population Density | 400.0 | 347.8 | 93.4 |
| Land Area | 0.3 | 1.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Paul, AR | Mountainburg, AR | United States |
| Age 0 to 4 | 0.0% | 4.2% | 5.9% |
| Age 5 to 9 | 5.7% | 3.2% | 6.1% |
| Age 10 to 14 | 3.8% | 8.3% | 6.6% |
| Age 15 to 17 | 6.6% | 2.3% | 3.9% |
| Age 18 to 20 | 8.5% | 5.9% | 4.0% |
| Age 21 to 24 | 3.8% | 5.1% | 5.2% |
| Age 25 to 34 | 11.3% | 14.2% | 13.8% |
| Age 35 to 44 | 2.8% | 13.8% | 12.9% |
| Age 45 to 54 | 23.6% | 13.6% | 12.6% |
| Age 55 to 59 | 4.7% | 3.6% | 6.7% |
| Age 60 to 64 | 0.9% | 6.3% | 6.3% |
| Age 65 to 74 | 13.2% | 10.8% | 9.6% |
| Age 75 to 84 | 10.4% | 6.3% | 4.5% |
| Age 85 and over | 4.7% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Paul, AR | Mountainburg, AR | United States |
| White | 68.9% | 86.4% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 1.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 19.8% | 8.5% | 3.2% |
| Hispanic | 11.3% | 3.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | St. Paul, AR | Mountainburg, AR | United States |
| Married Population | 45.8% | 50.6% | 49.8% |
| Currently Married | 45.8% | 46.5% | 48.0% |
| Married but Separated | 0.0% | 4.0% | 1.8% |
| Single Population | 54.2% | 49.4% | 50.2% |
| Never Married | 35.4% | 24.0% | 33.8% |
| Divorced | 6.3% | 13.7% | 10.8% |
| Widowed | 12.5% | 11.7% | 5.6% |
| space5 | | | |
| Household Size | 2.72 | 2.33 | 2.60 |
| Households | 39 | 227 | 124,010,992 |
| Family Households | 28 | 124 | 80,755,759 |
| Married couple, w/children | 17.9% | 37.1% | 30.5% |
| Married couple, no children | 50.0% | 39.5% | 42.9% |
| Non Family Households | 11 | 103 | 43,255,233 |
| Single householder, w/children | 32.1% | 16.9% | 15.8% |
| Single householder, no children | 0.0% | 6.5% | 10.8% |