| | Henryville, IN | Underwood, IA | United States |
| Population | 1,791 | 1,003 | 329,725,481 |
| Female Population | 52.9% | 52.6% | 50.5% |
| Male Population | 47.1% | 47.4% | 49.5% |
| Median Age | 35.6 | 29.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,201 | 940 | 309,327,143 |
| Population - 2000 | 1,545 | 688 | 285,036,114 |
| Population - 1990 | 1,194 | 515 | 251,960,433 |
| Pop. 2000 to Now | 30.9% | 40.3% | 15.6% |
| Pop. 1990 to Now | 69.4% | 87.4% | 30.8% |
| space4 | | | |
| Population Density | 629.1 | 914.3 | 93.4 |
| Land Area | 2.8 | 1.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Henryville, IN | Underwood, IA | United States |
| Age 0 to 4 | 9.6% | 11.4% | 5.9% |
| Age 5 to 9 | 5.4% | 8.3% | 6.1% |
| Age 10 to 14 | 2.5% | 11.3% | 6.6% |
| Age 15 to 17 | 3.4% | 7.0% | 3.9% |
| Age 18 to 20 | 3.0% | 2.9% | 4.0% |
| Age 21 to 24 | 8.8% | 4.9% | 5.2% |
| Age 25 to 34 | 15.5% | 13.0% | 13.8% |
| Age 35 to 44 | 11.7% | 11.9% | 12.9% |
| Age 45 to 54 | 9.1% | 9.4% | 12.6% |
| Age 55 to 59 | 7.8% | 7.2% | 6.7% |
| Age 60 to 64 | 5.4% | 4.3% | 6.3% |
| Age 65 to 74 | 7.8% | 5.1% | 9.6% |
| Age 75 to 84 | 8.4% | 3.6% | 4.5% |
| Age 85 and over | 1.8% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Henryville, IN | Underwood, IA | United States |
| White | 96.7% | 92.6% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 1.7% | 3.2% |
| Hispanic | 2.5% | 5.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Henryville, IN | Underwood, IA | United States |
| Married Population | 54.7% | 53.7% | 49.8% |
| Currently Married | 52.4% | 52.8% | 48.0% |
| Married but Separated | 2.3% | 0.9% | 1.8% |
| Single Population | 45.3% | 46.3% | 50.2% |
| Never Married | 26.0% | 31.5% | 33.8% |
| Divorced | 11.1% | 9.7% | 10.8% |
| Widowed | 8.2% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.64 | 2.96 | 2.60 |
| Households | 679 | 339 | 124,010,992 |
| Family Households | 520 | 242 | 80,755,759 |
| Married couple, w/children | 25.0% | 41.7% | 30.5% |
| Married couple, no children | 49.0% | 32.2% | 42.9% |
| Non Family Households | 159 | 97 | 43,255,233 |
| Single householder, w/children | 20.4% | 19.4% | 15.8% |
| Single householder, no children | 5.6% | 6.6% | 10.8% |