| | Fort Dodge, IA | Gonzales, LA | United States |
| Population | 24,826 | 12,080 | 329,725,481 |
| Female Population | 48.3% | 53.3% | 50.5% |
| Male Population | 51.7% | 46.7% | 49.5% |
| Median Age | 37 | 39.4 | 38.4 |
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| Population - 2010 | 25,119 | 9,818 | 309,327,143 |
| Population - 2000 | 25,136 | 8,156 | 285,036,114 |
| Population - 1990 | 25,894 | 7,003 | 251,960,433 |
| Pop. 2000 to Now | -4.9% | 37.9% | 15.6% |
| Pop. 1990 to Now | -7.7% | 60.6% | 30.8% |
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| Population Density | 1,547.4 | 1,321.7 | 93.4 |
| Land Area | 16.0 | 9.1 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Fort Dodge, IA | Gonzales, LA | United States |
| Age 0 to 4 | 5.4% | 4.3% | 5.9% |
| Age 5 to 9 | 6.1% | 6.4% | 6.1% |
| Age 10 to 14 | 5.5% | 5.2% | 6.6% |
| Age 15 to 17 | 3.9% | 6.6% | 3.9% |
| Age 18 to 20 | 6.4% | 2.8% | 4.0% |
| Age 21 to 24 | 6.8% | 4.7% | 5.2% |
| Age 25 to 34 | 12.9% | 15.5% | 13.8% |
| Age 35 to 44 | 11.6% | 12.8% | 12.9% |
| Age 45 to 54 | 10.8% | 8.4% | 12.6% |
| Age 55 to 59 | 6.4% | 12.8% | 6.7% |
| Age 60 to 64 | 5.8% | 4.4% | 6.3% |
| Age 65 to 74 | 9.7% | 9.3% | 9.6% |
| Age 75 to 84 | 5.7% | 5.1% | 4.5% |
| Age 85 and over | 2.6% | 1.7% | 1.9% |
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| Race | | | |
| | Fort Dodge, IA | Gonzales, LA | United States |
| White | 81.3% | 40.7% | 59.4% |
| Black | 6.1% | 48.4% | 12.2% |
| Asian | 1.9% | 1.7% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.2% | 0.4% |
| Two or More Races | 2.8% | 0.5% | 3.2% |
| Hispanic | 7.2% | 8.5% | 18.4% |
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| Marriage & Family | | | |
| | Fort Dodge, IA | Gonzales, LA | United States |
| Married Population | 38.5% | 41.6% | 49.8% |
| Currently Married | 36.6% | 40.0% | 48.0% |
| Married but Separated | 2.0% | 1.7% | 1.8% |
| Single Population | 61.5% | 58.4% | 50.2% |
| Never Married | 39.0% | 35.6% | 33.8% |
| Divorced | 15.6% | 16.8% | 10.8% |
| Widowed | 6.9% | 6.0% | 5.6% |
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| Household Size | 2.12 | 2.33 | 2.60 |
| Households | 10,437 | 5,083 | 124,010,992 |
| Family Households | 5,193 | 3,333 | 80,755,759 |
| Married couple, w/children | 22.4% | 17.8% | 30.5% |
| Married couple, no children | 45.7% | 40.2% | 42.9% |
| Non Family Households | 5,244 | 1,750 | 43,255,233 |
| Single householder, w/children | 23.5% | 30.9% | 15.8% |
| Single householder, no children | 8.4% | 11.1% | 10.8% |