| | Galva, IA | Willard, MO | United States |
| Population | 385 | 6,233 | 329,725,481 |
| Female Population | 51.2% | 50.3% | 50.5% |
| Male Population | 48.8% | 49.7% | 49.5% |
| Median Age | 29.7 | 31.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 438 | 5,307 | 309,327,143 |
| Population - 2000 | 368 | 3,193 | 285,036,114 |
| Population - 1990 | 398 | 2,177 | 251,960,433 |
| Pop. 2000 to Now | 15.2% | 79.6% | 15.6% |
| Pop. 1990 to Now | 6.5% | 163.5% | 30.8% |
| space4 | | | |
| Population Density | 540.7 | 1,032.8 | 93.4 |
| Land Area | 0.7 | 6.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Galva, IA | Willard, MO | United States |
| Age 0 to 4 | 11.7% | 7.3% | 5.9% |
| Age 5 to 9 | 13.2% | 8.4% | 6.1% |
| Age 10 to 14 | 7.3% | 14.7% | 6.6% |
| Age 15 to 17 | 1.8% | 5.2% | 3.9% |
| Age 18 to 20 | 2.9% | 3.7% | 4.0% |
| Age 21 to 24 | 6.5% | 4.3% | 5.2% |
| Age 25 to 34 | 14.0% | 11.4% | 13.8% |
| Age 35 to 44 | 9.4% | 13.8% | 12.9% |
| Age 45 to 54 | 9.1% | 11.1% | 12.6% |
| Age 55 to 59 | 7.5% | 8.1% | 6.7% |
| Age 60 to 64 | 5.7% | 3.9% | 6.3% |
| Age 65 to 74 | 4.9% | 4.8% | 9.6% |
| Age 75 to 84 | 4.9% | 2.6% | 4.5% |
| Age 85 and over | 1.0% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Galva, IA | Willard, MO | United States |
| White | 90.4% | 94.1% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.1% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 1.6% | 3.0% | 3.2% |
| Hispanic | 8.1% | 2.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Galva, IA | Willard, MO | United States |
| Married Population | 67.1% | 67.9% | 49.8% |
| Currently Married | 64.8% | 67.6% | 48.0% |
| Married but Separated | 2.3% | 0.3% | 1.8% |
| Single Population | 33.0% | 32.1% | 50.2% |
| Never Married | 18.4% | 20.7% | 33.8% |
| Divorced | 10.0% | 6.5% | 10.8% |
| Widowed | 4.6% | 4.9% | 5.6% |
| space5 | | | |
| Household Size | 2.69 | 3.11 | 2.60 |
| Households | 143 | 1,987 | 124,010,992 |
| Family Households | 83 | 1,665 | 80,755,759 |
| Married couple, w/children | 34.9% | 45.4% | 30.5% |
| Married couple, no children | 49.4% | 39.8% | 42.9% |
| Non Family Households | 60 | 322 | 43,255,233 |
| Single householder, w/children | 14.5% | 8.2% | 15.8% |
| Single householder, no children | 1.2% | 6.7% | 10.8% |