| | St. Olaf, IA | Asbury, IA | United States |
| Population | 135 | 5,795 | 329,725,481 |
| Female Population | 44.4% | 53.1% | 50.5% |
| Male Population | 55.6% | 46.9% | 49.5% |
| Median Age | 35.2 | 37.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 108 | 4,477 | 309,327,143 |
| Population - 2000 | 136 | 2,450 | 285,036,114 |
| Population - 1990 | 111 | 2,013 | 251,960,433 |
| Pop. 2000 to Now | -27.2% | 138.4% | 15.6% |
| Pop. 1990 to Now | -10.8% | 190.2% | 30.8% |
| space4 | | | |
| Population Density | 553.3 | 1,835.6 | 93.4 |
| Land Area | 0.2 | 3.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Olaf, IA | Asbury, IA | United States |
| Age 0 to 4 | 11.1% | 10.1% | 5.9% |
| Age 5 to 9 | 8.1% | 11.8% | 6.1% |
| Age 10 to 14 | 11.1% | 5.9% | 6.6% |
| Age 15 to 17 | 2.2% | 7.1% | 3.9% |
| Age 18 to 20 | 3.7% | 2.5% | 4.0% |
| Age 21 to 24 | 1.5% | 1.6% | 5.2% |
| Age 25 to 34 | 11.9% | 5.9% | 13.8% |
| Age 35 to 44 | 16.3% | 17.5% | 12.9% |
| Age 45 to 54 | 8.1% | 12.4% | 12.6% |
| Age 55 to 59 | 7.4% | 4.7% | 6.7% |
| Age 60 to 64 | 9.6% | 5.9% | 6.3% |
| Age 65 to 74 | 5.2% | 10.9% | 9.6% |
| Age 75 to 84 | 3.7% | 3.4% | 4.5% |
| Age 85 and over | 0.0% | 0.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Olaf, IA | Asbury, IA | United States |
| White | 85.9% | 92.7% | 59.4% |
| Black | 5.2% | 1.7% | 12.2% |
| Asian | 0.0% | 3.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 8.9% | 1.5% | 3.2% |
| Hispanic | 0.0% | 1.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | St. Olaf, IA | Asbury, IA | United States |
| Married Population | 59.6% | 69.8% | 49.8% |
| Currently Married | 59.6% | 69.7% | 48.0% |
| Married but Separated | 0.0% | 0.1% | 1.8% |
| Single Population | 40.4% | 30.2% | 50.2% |
| Never Married | 26.6% | 20.1% | 33.8% |
| Divorced | 11.7% | 7.4% | 10.8% |
| Widowed | 2.1% | 2.8% | 5.6% |
| space5 | | | |
| Household Size | 3.00 | 2.98 | 2.60 |
| Households | 45 | 1,942 | 124,010,992 |
| Family Households | 33 | 1,647 | 80,755,759 |
| Married couple, w/children | 30.3% | 43.2% | 30.5% |
| Married couple, no children | 57.6% | 42.7% | 42.9% |
| Non Family Households | 12 | 295 | 43,255,233 |
| Single householder, w/children | 9.1% | 13.2% | 15.8% |
| Single householder, no children | 3.0% | 0.9% | 10.8% |