| | Norridge, IL | Bellevue, WI | United States |
| Population | 15,294 | 15,922 | 329,725,481 |
| Female Population | 52.6% | 48.6% | 50.5% |
| Male Population | 47.4% | 51.4% | 49.5% |
| Median Age | 46.2 | 39.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 14,574 | 14,785 | 309,327,143 |
| Population - 2000 | 14,582 | 11,511 | 285,036,114 |
| Population - 1990 | 14,459 | 7,809 | 251,960,433 |
| Pop. 2000 to Now | -4.2% | 39.3% | 15.6% |
| Pop. 1990 to Now | -3.4% | 105.3% | 30.8% |
| space4 | | | |
| Population Density | 8,449.7 | 1,110.9 | 93.4 |
| Land Area | 1.8 | 14.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Norridge, IL | Bellevue, WI | United States |
| Age 0 to 4 | 4.5% | 4.4% | 5.9% |
| Age 5 to 9 | 5.6% | 8.1% | 6.1% |
| Age 10 to 14 | 4.4% | 8.3% | 6.6% |
| Age 15 to 17 | 3.1% | 3.5% | 3.9% |
| Age 18 to 20 | 3.3% | 2.5% | 4.0% |
| Age 21 to 24 | 3.6% | 5.2% | 5.2% |
| Age 25 to 34 | 10.6% | 11.3% | 13.8% |
| Age 35 to 44 | 13.1% | 12.8% | 12.9% |
| Age 45 to 54 | 14.4% | 12.8% | 12.6% |
| Age 55 to 59 | 7.6% | 7.3% | 6.7% |
| Age 60 to 64 | 7.9% | 7.8% | 6.3% |
| Age 65 to 74 | 9.3% | 9.4% | 9.6% |
| Age 75 to 84 | 7.9% | 5.4% | 4.5% |
| Age 85 and over | 4.6% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Norridge, IL | Bellevue, WI | United States |
| White | 84.1% | 75.9% | 59.4% |
| Black | 1.1% | 0.8% | 12.2% |
| Asian | 3.8% | 7.2% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.6% | 0.4% |
| Two or More Races | 1.9% | 3.9% | 3.2% |
| Hispanic | 8.7% | 11.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Norridge, IL | Bellevue, WI | United States |
| Married Population | 52.3% | 53.9% | 49.8% |
| Currently Married | 51.4% | 53.9% | 48.0% |
| Married but Separated | 0.9% | 0.0% | 1.8% |
| Single Population | 47.7% | 46.1% | 50.2% |
| Never Married | 30.6% | 27.4% | 33.8% |
| Divorced | 8.2% | 14.4% | 10.8% |
| Widowed | 8.9% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 2.53 | 2.39 | 2.60 |
| Households | 5,880 | 6,665 | 124,010,992 |
| Family Households | 3,963 | 4,274 | 80,755,759 |
| Married couple, w/children | 26.8% | 26.9% | 30.5% |
| Married couple, no children | 50.7% | 48.9% | 42.9% |
| Non Family Households | 1,917 | 2,391 | 43,255,233 |
| Single householder, w/children | 11.3% | 18.0% | 15.8% |
| Single householder, no children | 11.2% | 6.2% | 10.8% |