| | Bettendorf, IA | Bellingham, WA | United States |
| Population | 38,631 | 90,545 | 329,725,481 |
| Female Population | 52.0% | 51.5% | 50.5% |
| Male Population | 48.0% | 48.5% | 49.5% |
| Median Age | 38.9 | 33.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 33,281 | 81,705 | 309,327,143 |
| Population - 2000 | 31,275 | 67,171 | 285,036,114 |
| Population - 1990 | 28,132 | 52,179 | 251,960,433 |
| Pop. 2000 to Now | 17.2% | 39.9% | 15.6% |
| Pop. 1990 to Now | 30.3% | 80.1% | 30.8% |
| space4 | | | |
| Population Density | 1,813.9 | 3,269.1 | 93.4 |
| Land Area | 21.3 | 27.7 | 3,531,905.4 |
| Water Area | 1.1 | 2.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Bettendorf, IA | Bellingham, WA | United States |
| Age 0 to 4 | 6.2% | 3.4% | 5.9% |
| Age 5 to 9 | 8.0% | 4.0% | 6.1% |
| Age 10 to 14 | 7.3% | 3.6% | 6.6% |
| Age 15 to 17 | 4.5% | 2.4% | 3.9% |
| Age 18 to 20 | 3.7% | 9.6% | 4.0% |
| Age 21 to 24 | 2.6% | 13.2% | 5.2% |
| Age 25 to 34 | 11.7% | 15.7% | 13.8% |
| Age 35 to 44 | 14.3% | 11.8% | 12.9% |
| Age 45 to 54 | 13.0% | 9.8% | 12.6% |
| Age 55 to 59 | 5.7% | 4.9% | 6.7% |
| Age 60 to 64 | 6.0% | 5.8% | 6.3% |
| Age 65 to 74 | 10.0% | 9.5% | 9.6% |
| Age 75 to 84 | 5.6% | 4.5% | 4.5% |
| Age 85 and over | 1.4% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bettendorf, IA | Bellingham, WA | United States |
| White | 83.5% | 77.4% | 59.4% |
| Black | 1.8% | 1.3% | 12.2% |
| Asian | 6.4% | 5.7% | 5.6% |
| Native American | 0.1% | 0.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.2% | 0.1% | 0.4% |
| Two or More Races | 3.5% | 5.1% | 3.2% |
| Hispanic | 4.6% | 9.5% | 18.4% |
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| Marriage & Family | | | |
| | Bettendorf, IA | Bellingham, WA | United States |
| Married Population | 56.6% | 38.7% | 49.8% |
| Currently Married | 55.4% | 37.6% | 48.0% |
| Married but Separated | 1.3% | 1.1% | 1.8% |
| Single Population | 43.4% | 61.3% | 50.2% |
| Never Married | 25.4% | 47.0% | 33.8% |
| Divorced | 12.9% | 10.4% | 10.8% |
| Widowed | 5.1% | 3.9% | 5.6% |
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| Household Size | 2.51 | 2.18 | 2.60 |
| Households | 15,311 | 39,496 | 124,010,992 |
| Family Households | 10,374 | 18,062 | 80,755,759 |
| Married couple, w/children | 38.6% | 25.9% | 30.5% |
| Married couple, no children | 41.1% | 51.2% | 42.9% |
| Non Family Households | 4,937 | 21,434 | 43,255,233 |
| Single householder, w/children | 15.0% | 13.6% | 15.8% |
| Single householder, no children | 5.4% | 9.3% | 10.8% |