| | Carol Stream, IL | Cody, WY | United States |
| Population | 39,895 | 10,055 | 329,725,481 |
| Female Population | 50.4% | 49.9% | 50.5% |
| Male Population | 49.6% | 50.1% | 49.5% |
| Median Age | 39.8 | 41 | 38.4 |
| space3 | | | |
| Population - 2010 | 39,543 | 9,539 | 309,327,143 |
| Population - 2000 | 40,438 | 8,835 | 285,036,114 |
| Population - 1990 | 31,716 | 7,897 | 251,960,433 |
| Pop. 2000 to Now | -4.0% | 11.5% | 15.6% |
| Pop. 1990 to Now | 22.4% | 24.7% | 30.8% |
| space4 | | | |
| Population Density | 4,379.7 | 987.1 | 93.4 |
| Land Area | 9.1 | 10.2 | 3,531,905.4 |
| Water Area | 0.3 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Carol Stream, IL | Cody, WY | United States |
| Age 0 to 4 | 5.6% | 6.6% | 5.9% |
| Age 5 to 9 | 5.5% | 4.7% | 6.1% |
| Age 10 to 14 | 5.8% | 7.9% | 6.6% |
| Age 15 to 17 | 4.3% | 2.2% | 3.9% |
| Age 18 to 20 | 3.6% | 3.0% | 4.0% |
| Age 21 to 24 | 6.2% | 5.9% | 5.2% |
| Age 25 to 34 | 12.7% | 12.3% | 13.8% |
| Age 35 to 44 | 12.7% | 13.0% | 12.9% |
| Age 45 to 54 | 13.1% | 9.5% | 12.6% |
| Age 55 to 59 | 8.8% | 8.1% | 6.7% |
| Age 60 to 64 | 6.8% | 7.3% | 6.3% |
| Age 65 to 74 | 9.4% | 9.6% | 9.6% |
| Age 75 to 84 | 3.5% | 7.6% | 4.5% |
| Age 85 and over | 2.0% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Carol Stream, IL | Cody, WY | United States |
| White | 53.5% | 90.0% | 59.4% |
| Black | 6.8% | 0.6% | 12.2% |
| Asian | 20.4% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.4% | 0.6% | 0.4% |
| Two or More Races | 2.5% | 1.7% | 3.2% |
| Hispanic | 16.4% | 7.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Carol Stream, IL | Cody, WY | United States |
| Married Population | 54.5% | 53.4% | 49.8% |
| Currently Married | 53.9% | 52.4% | 48.0% |
| Married but Separated | 0.6% | 1.0% | 1.8% |
| Single Population | 45.5% | 46.6% | 50.2% |
| Never Married | 30.6% | 23.6% | 33.8% |
| Divorced | 10.5% | 17.0% | 10.8% |
| Widowed | 4.5% | 5.9% | 5.6% |
| space5 | | | |
| Household Size | 2.78 | 2.28 | 2.60 |
| Households | 14,195 | 4,401 | 124,010,992 |
| Family Households | 10,514 | 2,672 | 80,755,759 |
| Married couple, w/children | 32.4% | 38.2% | 30.5% |
| Married couple, no children | 45.5% | 37.9% | 42.9% |
| Non Family Households | 3,681 | 1,729 | 43,255,233 |
| Single householder, w/children | 10.5% | 10.0% | 15.8% |
| Single householder, no children | 11.6% | 13.9% | 10.8% |