| | Webster, IA | Washington, IA | United States |
| Population | 123 | 7,314 | 329,725,481 |
| Female Population | 47.2% | 55.0% | 50.5% |
| Male Population | 52.9% | 45.1% | 49.5% |
| Median Age | 43.5 | 40.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 89 | 7,262 | 309,327,143 |
| Population - 2000 | 110 | 7,047 | 285,036,114 |
| Population - 1990 | 103 | 7,074 | 251,960,433 |
| Pop. 2000 to Now | -35.5% | 2.3% | 15.6% |
| Pop. 1990 to Now | -31.1% | 1.9% | 30.8% |
| space4 | | | |
| Population Density | 380.8 | 1,394.7 | 93.4 |
| Land Area | 0.3 | 5.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Webster, IA | Washington, IA | United States |
| Age 0 to 4 | 2.4% | 6.1% | 5.9% |
| Age 5 to 9 | 7.3% | 6.0% | 6.1% |
| Age 10 to 14 | 3.3% | 6.5% | 6.6% |
| Age 15 to 17 | 16.3% | 3.4% | 3.9% |
| Age 18 to 20 | 0.0% | 2.6% | 4.0% |
| Age 21 to 24 | 11.4% | 5.8% | 5.2% |
| Age 25 to 34 | 7.3% | 14.7% | 13.8% |
| Age 35 to 44 | 6.5% | 10.1% | 12.9% |
| Age 45 to 54 | 13.8% | 11.4% | 12.6% |
| Age 55 to 59 | 11.4% | 6.5% | 6.7% |
| Age 60 to 64 | 4.9% | 5.5% | 6.3% |
| Age 65 to 74 | 6.5% | 12.2% | 9.6% |
| Age 75 to 84 | 7.3% | 5.9% | 4.5% |
| Age 85 and over | 1.6% | 3.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Webster, IA | Washington, IA | United States |
| White | 78.0% | 85.9% | 59.4% |
| Black | 0.0% | 1.7% | 12.2% |
| Asian | 0.0% | 1.0% | 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% | 2.3% | 3.2% |
| Hispanic | 22.0% | 9.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Webster, IA | Washington, IA | United States |
| Married Population | 50.5% | 47.4% | 49.8% |
| Currently Married | 50.5% | 45.8% | 48.0% |
| Married but Separated | 0.0% | 1.6% | 1.8% |
| Single Population | 49.5% | 52.6% | 50.2% |
| Never Married | 40.2% | 29.8% | 33.8% |
| Divorced | 0.0% | 15.3% | 10.8% |
| Widowed | 9.3% | 7.5% | 5.6% |
| space5 | | | |
| Household Size | 2.67 | 2.30 | 2.60 |
| Households | 46 | 3,092 | 124,010,992 |
| Family Households | 25 | 1,854 | 80,755,759 |
| Married couple, w/children | 20.0% | 23.2% | 30.5% |
| Married couple, no children | 68.0% | 43.3% | 42.9% |
| Non Family Households | 21 | 1,238 | 43,255,233 |
| Single householder, w/children | 4.0% | 22.3% | 15.8% |
| Single householder, no children | 8.0% | 11.2% | 10.8% |