| | Wilton, IA | West Branch, IA | United States |
| Population | 2,916 | 2,289 | 329,725,481 |
| Female Population | 50.9% | 53.8% | 50.5% |
| Male Population | 49.1% | 46.2% | 49.5% |
| Median Age | 46.2 | 36.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,792 | 2,331 | 309,327,143 |
| Population - 2000 | 2,829 | 2,188 | 285,036,114 |
| Population - 1990 | 2,577 | 1,908 | 251,960,433 |
| Pop. 2000 to Now | -1.0% | 15.1% | 15.6% |
| Pop. 1990 to Now | 8.7% | 32.0% | 30.8% |
| space4 | | | |
| Population Density | 1,416.9 | 942.0 | 93.4 |
| Land Area | 2.1 | 2.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Wilton, IA | West Branch, IA | United States |
| Age 0 to 4 | 6.8% | 5.8% | 5.9% |
| Age 5 to 9 | 2.3% | 7.3% | 6.1% |
| Age 10 to 14 | 6.3% | 8.3% | 6.6% |
| Age 15 to 17 | 3.4% | 3.0% | 3.9% |
| Age 18 to 20 | 5.2% | 2.8% | 4.0% |
| Age 21 to 24 | 6.7% | 8.9% | 5.2% |
| Age 25 to 34 | 9.3% | 10.0% | 13.8% |
| Age 35 to 44 | 9.3% | 13.8% | 12.9% |
| Age 45 to 54 | 13.7% | 11.1% | 12.6% |
| Age 55 to 59 | 9.2% | 5.5% | 6.7% |
| Age 60 to 64 | 10.5% | 5.9% | 6.3% |
| Age 65 to 74 | 11.8% | 10.9% | 9.6% |
| Age 75 to 84 | 4.7% | 3.2% | 4.5% |
| Age 85 and over | 0.8% | 3.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Wilton, IA | West Branch, IA | United States |
| White | 92.5% | 90.2% | 59.4% |
| Black | 0.0% | 1.1% | 12.2% |
| Asian | 0.0% | 2.0% | 5.6% |
| Native American | 0.4% | 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% | 2.5% | 3.2% |
| Hispanic | 7.1% | 4.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Wilton, IA | West Branch, IA | United States |
| Married Population | 57.1% | 55.7% | 49.8% |
| Currently Married | 55.6% | 54.2% | 48.0% |
| Married but Separated | 1.5% | 1.4% | 1.8% |
| Single Population | 42.9% | 44.3% | 50.2% |
| Never Married | 25.3% | 27.3% | 33.8% |
| Divorced | 14.4% | 9.5% | 10.8% |
| Widowed | 3.3% | 7.5% | 5.6% |
| space5 | | | |
| Household Size | 2.15 | 2.50 | 2.60 |
| Households | 1,344 | 895 | 124,010,992 |
| Family Households | 813 | 554 | 80,755,759 |
| Married couple, w/children | 15.3% | 40.6% | 30.5% |
| Married couple, no children | 58.7% | 46.8% | 42.9% |
| Non Family Households | 531 | 341 | 43,255,233 |
| Single householder, w/children | 16.2% | 9.2% | 15.8% |
| Single householder, no children | 9.8% | 3.4% | 10.8% |