| | Hazelwood, MO | Benton, AR | United States |
| Population | 25,466 | 34,746 | 329,725,481 |
| Female Population | 53.4% | 51.6% | 50.5% |
| Male Population | 46.6% | 48.4% | 49.5% |
| Median Age | 38.7 | 37.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 25,714 | 30,925 | 309,327,143 |
| Population - 2000 | 26,206 | 21,906 | 285,036,114 |
| Population - 1990 | 15,324 | 18,177 | 251,960,433 |
| Pop. 2000 to Now | -4.4% | 69.9% | 15.6% |
| Pop. 1990 to Now | 63.4% | 104.7% | 30.8% |
| space4 | | | |
| Population Density | 1,585.0 | 1,553.5 | 93.4 |
| Land Area | 16.1 | 22.4 | 3,531,905.4 |
| Water Area | 0.7 | 0.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hazelwood, MO | Benton, AR | United States |
| Age 0 to 4 | 6.4% | 6.7% | 5.9% |
| Age 5 to 9 | 7.9% | 7.0% | 6.1% |
| Age 10 to 14 | 5.0% | 7.3% | 6.6% |
| Age 15 to 17 | 3.6% | 4.1% | 3.9% |
| Age 18 to 20 | 3.6% | 3.3% | 4.0% |
| Age 21 to 24 | 9.2% | 5.2% | 5.2% |
| Age 25 to 34 | 11.3% | 13.2% | 13.8% |
| Age 35 to 44 | 12.3% | 14.6% | 12.9% |
| Age 45 to 54 | 10.6% | 13.6% | 12.6% |
| Age 55 to 59 | 7.5% | 5.3% | 6.7% |
| Age 60 to 64 | 7.6% | 4.7% | 6.3% |
| Age 65 to 74 | 8.8% | 9.7% | 9.6% |
| Age 75 to 84 | 4.1% | 3.6% | 4.5% |
| Age 85 and over | 2.0% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hazelwood, MO | Benton, AR | United States |
| White | 46.3% | 79.8% | 59.4% |
| Black | 40.4% | 10.9% | 12.2% |
| Asian | 2.5% | 1.3% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.3% | 0.1% | 0.4% |
| Two or More Races | 6.3% | 2.7% | 3.2% |
| Hispanic | 4.1% | 4.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hazelwood, MO | Benton, AR | United States |
| Married Population | 40.3% | 52.3% | 49.8% |
| Currently Married | 38.3% | 50.6% | 48.0% |
| Married but Separated | 2.0% | 1.7% | 1.8% |
| Single Population | 59.7% | 47.7% | 50.2% |
| Never Married | 37.0% | 26.6% | 33.8% |
| Divorced | 15.0% | 14.9% | 10.8% |
| Widowed | 7.6% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.27 | 2.46 | 2.60 |
| Households | 11,137 | 13,971 | 124,010,992 |
| Family Households | 6,298 | 9,324 | 80,755,759 |
| Married couple, w/children | 23.9% | 32.7% | 30.5% |
| Married couple, no children | 36.0% | 38.4% | 42.9% |
| Non Family Households | 4,839 | 4,647 | 43,255,233 |
| Single householder, w/children | 22.8% | 20.7% | 15.8% |
| Single householder, no children | 17.3% | 8.1% | 10.8% |