| | Swan, IA | Eddyville, IA | United States |
| Population | 49 | 1,101 | 329,725,481 |
| Female Population | 53.1% | 52.1% | 50.5% |
| Male Population | 46.9% | 47.9% | 49.5% |
| Median Age | 47.6 | 36.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 72 | 1,029 | 309,327,143 |
| Population - 2000 | 121 | 1,064 | 285,036,114 |
| Population - 1990 | 76 | 1,010 | 251,960,433 |
| Pop. 2000 to Now | -38.8% | -5.1% | 15.6% |
| Pop. 1990 to Now | -2.6% | 0.0% | 30.8% |
| space4 | | | |
| Population Density | 76.2 | 932.3 | 93.4 |
| Land Area | 0.6 | 1.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Swan, IA | Eddyville, IA | United States |
| Age 0 to 4 | 0.0% | 3.8% | 5.9% |
| Age 5 to 9 | 18.4% | 6.9% | 6.1% |
| Age 10 to 14 | 2.0% | 10.4% | 6.6% |
| Age 15 to 17 | 2.0% | 5.5% | 3.9% |
| Age 18 to 20 | 4.1% | 6.0% | 4.0% |
| Age 21 to 24 | 8.2% | 4.3% | 5.2% |
| Age 25 to 34 | 0.0% | 13.0% | 13.8% |
| Age 35 to 44 | 10.2% | 7.2% | 12.9% |
| Age 45 to 54 | 16.3% | 10.9% | 12.6% |
| Age 55 to 59 | 14.3% | 6.9% | 6.7% |
| Age 60 to 64 | 12.2% | 5.0% | 6.3% |
| Age 65 to 74 | 6.1% | 10.3% | 9.6% |
| Age 75 to 84 | 4.1% | 9.3% | 4.5% |
| Age 85 and over | 2.0% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Swan, IA | Eddyville, IA | United States |
| White | 75.5% | 98.2% | 59.4% |
| Black | 18.4% | 0.5% | 12.2% |
| Asian | 0.0% | 0.0% | 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 | 0.0% | 0.9% | 3.2% |
| Hispanic | 6.1% | 0.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Swan, IA | Eddyville, IA | United States |
| Married Population | 35.9% | 49.5% | 49.8% |
| Currently Married | 35.9% | 48.2% | 48.0% |
| Married but Separated | 0.0% | 1.3% | 1.8% |
| Single Population | 64.1% | 50.5% | 50.2% |
| Never Married | 25.6% | 28.5% | 33.8% |
| Divorced | 30.8% | 14.6% | 10.8% |
| Widowed | 7.7% | 7.4% | 5.6% |
| space5 | | | |
| Household Size | 2.45 | 2.75 | 2.60 |
| Households | 20 | 400 | 124,010,992 |
| Family Households | 11 | 311 | 80,755,759 |
| Married couple, w/children | 0.0% | 23.5% | 30.5% |
| Married couple, no children | 54.5% | 41.8% | 42.9% |
| Non Family Households | 9 | 89 | 43,255,233 |
| Single householder, w/children | 27.3% | 25.1% | 15.8% |
| Single householder, no children | 18.2% | 9.6% | 10.8% |