| | Waukee, IA | Hayward, CA | United States |
| Population | 23,441 | 162,254 | 329,725,481 |
| Female Population | 52.4% | 49.3% | 50.5% |
| Male Population | 47.6% | 50.7% | 49.5% |
| Median Age | 34.1 | 36.6 | 38.4 |
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| Population - 2010 | 14,018 | 144,662 | 309,327,143 |
| Population - 2000 | 5,126 | 140,030 | 285,036,114 |
| Population - 1990 | 2,512 | 111,498 | 251,960,433 |
| Pop. 2000 to Now | 410.5% | 12.8% | 15.6% |
| Pop. 1990 to Now | 941.6% | 41.7% | 30.8% |
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| Population Density | 1,131.3 | 3,563.1 | 93.4 |
| Land Area | 20.7 | 45.5 | 3,531,905.4 |
| Water Area | 0.0 | 18.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Waukee, IA | Hayward, CA | United States |
| Age 0 to 4 | 8.4% | 5.9% | 5.9% |
| Age 5 to 9 | 7.9% | 5.4% | 6.1% |
| Age 10 to 14 | 8.7% | 5.9% | 6.6% |
| Age 15 to 17 | 3.8% | 3.9% | 3.9% |
| Age 18 to 20 | 3.3% | 3.7% | 4.0% |
| Age 21 to 24 | 3.7% | 5.2% | 5.2% |
| Age 25 to 34 | 16.0% | 17.3% | 13.8% |
| Age 35 to 44 | 16.7% | 14.4% | 12.9% |
| Age 45 to 54 | 13.0% | 13.0% | 12.6% |
| Age 55 to 59 | 5.0% | 6.7% | 6.7% |
| Age 60 to 64 | 3.0% | 5.9% | 6.3% |
| Age 65 to 74 | 6.3% | 7.6% | 9.6% |
| Age 75 to 84 | 3.1% | 3.5% | 4.5% |
| Age 85 and over | 1.1% | 1.6% | 1.9% |
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| Race | | | |
| | Waukee, IA | Hayward, CA | United States |
| White | 83.2% | 15.9% | 59.4% |
| Black | 3.1% | 9.1% | 12.2% |
| Asian | 4.7% | 28.7% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.9% | 0.2% |
| Other | 0.6% | 0.4% | 0.4% |
| Two or More Races | 3.7% | 4.8% | 3.2% |
| Hispanic | 4.6% | 38.9% | 18.4% |
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| Marriage & Family | | | |
| | Waukee, IA | Hayward, CA | United States |
| Married Population | 60.8% | 48.4% | 49.8% |
| Currently Married | 60.3% | 46.7% | 48.0% |
| Married but Separated | 0.5% | 1.8% | 1.8% |
| Single Population | 39.2% | 51.6% | 50.2% |
| Never Married | 26.4% | 38.5% | 33.8% |
| Divorced | 9.2% | 8.1% | 10.8% |
| Widowed | 3.5% | 5.0% | 5.6% |
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| Household Size | 2.52 | 3.21 | 2.60 |
| Households | 9,289 | 49,524 | 124,010,992 |
| Family Households | 6,104 | 36,296 | 80,755,759 |
| Married couple, w/children | 48.0% | 34.5% | 30.5% |
| Married couple, no children | 34.8% | 34.7% | 42.9% |
| Non Family Households | 3,185 | 13,228 | 43,255,233 |
| Single householder, w/children | 14.7% | 15.7% | 15.8% |
| Single householder, no children | 2.5% | 15.2% | 10.8% |