| | Red Oak, IA | Wilder, KY | United States |
| Population | 5,576 | 3,147 | 329,725,481 |
| Female Population | 52.9% | 50.2% | 50.5% |
| Male Population | 47.1% | 49.8% | 49.5% |
| Median Age | 37.8 | 43 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,713 | 3,040 | 309,327,143 |
| Population - 2000 | 6,197 | 2,624 | 285,036,114 |
| Population - 1990 | 6,264 | 691 | 251,960,433 |
| Pop. 2000 to Now | -14.9% | 16.7% | 15.6% |
| Pop. 1990 to Now | -15.9% | 343.0% | 30.8% |
| space4 | | | |
| Population Density | 1,413.1 | 868.1 | 93.4 |
| Land Area | 3.9 | 3.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Red Oak, IA | Wilder, KY | United States |
| Age 0 to 4 | 5.5% | 5.0% | 5.9% |
| Age 5 to 9 | 10.0% | 3.7% | 6.1% |
| Age 10 to 14 | 7.2% | 6.7% | 6.6% |
| Age 15 to 17 | 2.7% | 4.5% | 3.9% |
| Age 18 to 20 | 3.4% | 2.8% | 4.0% |
| Age 21 to 24 | 5.6% | 4.2% | 5.2% |
| Age 25 to 34 | 10.1% | 11.9% | 13.8% |
| Age 35 to 44 | 10.4% | 11.7% | 12.9% |
| Age 45 to 54 | 12.8% | 10.8% | 12.6% |
| Age 55 to 59 | 5.8% | 8.1% | 6.7% |
| Age 60 to 64 | 7.6% | 9.8% | 6.3% |
| Age 65 to 74 | 8.7% | 14.1% | 9.6% |
| Age 75 to 84 | 5.6% | 6.2% | 4.5% |
| Age 85 and over | 4.5% | 0.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Red Oak, IA | Wilder, KY | United States |
| White | 90.9% | 99.5% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.4% | 0.2% | 5.6% |
| Native American | 0.6% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.0% | 0.0% | 0.4% |
| Two or More Races | 2.7% | 0.2% | 3.2% |
| Hispanic | 4.5% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Red Oak, IA | Wilder, KY | United States |
| Married Population | 48.2% | 40.7% | 49.8% |
| Currently Married | 47.4% | 39.5% | 48.0% |
| Married but Separated | 0.8% | 1.2% | 1.8% |
| Single Population | 51.8% | 59.3% | 50.2% |
| Never Married | 31.4% | 31.1% | 33.8% |
| Divorced | 11.9% | 21.9% | 10.8% |
| Widowed | 8.5% | 6.3% | 5.6% |
| space5 | | | |
| Household Size | 2.30 | 1.97 | 2.60 |
| Households | 2,380 | 1,596 | 124,010,992 |
| Family Households | 1,424 | 730 | 80,755,759 |
| Married couple, w/children | 19.6% | 28.6% | 30.5% |
| Married couple, no children | 44.9% | 42.5% | 42.9% |
| Non Family Households | 956 | 866 | 43,255,233 |
| Single householder, w/children | 26.8% | 17.0% | 15.8% |
| Single householder, no children | 8.7% | 11.9% | 10.8% |