| | Guttenberg, IA | Fort Dodge, IA | United States |
| Population | 1,578 | 24,826 | 329,725,481 |
| Female Population | 57.4% | 48.3% | 50.5% |
| Male Population | 42.7% | 51.7% | 49.5% |
| Median Age | 58.4 | 37 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,921 | 25,119 | 309,327,143 |
| Population - 2000 | 1,987 | 25,136 | 285,036,114 |
| Population - 1990 | 2,257 | 25,894 | 251,960,433 |
| Pop. 2000 to Now | -10.3% | -4.9% | 15.6% |
| Pop. 1990 to Now | -21.0% | -7.7% | 30.8% |
| space4 | | | |
| Population Density | 754.7 | 1,547.4 | 93.4 |
| Land Area | 2.1 | 16.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Guttenberg, IA | Fort Dodge, IA | United States |
| Age 0 to 4 | 2.4% | 5.4% | 5.9% |
| Age 5 to 9 | 2.5% | 6.1% | 6.1% |
| Age 10 to 14 | 3.5% | 5.5% | 6.6% |
| Age 15 to 17 | 3.7% | 3.9% | 3.9% |
| Age 18 to 20 | 2.7% | 6.4% | 4.0% |
| Age 21 to 24 | 3.8% | 6.8% | 5.2% |
| Age 25 to 34 | 4.6% | 12.9% | 13.8% |
| Age 35 to 44 | 9.4% | 11.6% | 12.9% |
| Age 45 to 54 | 13.3% | 10.8% | 12.6% |
| Age 55 to 59 | 7.9% | 6.4% | 6.7% |
| Age 60 to 64 | 16.2% | 5.8% | 6.3% |
| Age 65 to 74 | 14.0% | 9.7% | 9.6% |
| Age 75 to 84 | 7.8% | 5.7% | 4.5% |
| Age 85 and over | 8.3% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Guttenberg, IA | Fort Dodge, IA | United States |
| White | 99.7% | 81.3% | 59.4% |
| Black | 0.0% | 6.1% | 12.2% |
| Asian | 0.0% | 1.9% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 0.0% | 2.8% | 3.2% |
| Hispanic | 0.3% | 7.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Guttenberg, IA | Fort Dodge, IA | United States |
| Married Population | 51.2% | 38.5% | 49.8% |
| Currently Married | 50.0% | 36.6% | 48.0% |
| Married but Separated | 1.2% | 2.0% | 1.8% |
| Single Population | 48.8% | 61.5% | 50.2% |
| Never Married | 23.1% | 39.0% | 33.8% |
| Divorced | 15.6% | 15.6% | 10.8% |
| Widowed | 10.1% | 6.9% | 5.6% |
| space5 | | | |
| Household Size | 1.77 | 2.12 | 2.60 |
| Households | 851 | 10,437 | 124,010,992 |
| Family Households | 448 | 5,193 | 80,755,759 |
| Married couple, w/children | 9.8% | 22.4% | 30.5% |
| Married couple, no children | 70.3% | 45.7% | 42.9% |
| Non Family Households | 403 | 5,244 | 43,255,233 |
| Single householder, w/children | 10.9% | 23.5% | 15.8% |
| Single householder, no children | 8.9% | 8.4% | 10.8% |