| | Mounds, IL | Anna, IL | United States |
| Population | 901 | 4,262 | 329,725,481 |
| Female Population | 50.9% | 47.9% | 50.5% |
| Male Population | 49.1% | 52.1% | 49.5% |
| Median Age | 42.4 | 43.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 805 | 4,417 | 309,327,143 |
| Population - 2000 | 1,117 | 5,136 | 285,036,114 |
| Population - 1990 | 1,407 | 4,805 | 251,960,433 |
| Pop. 2000 to Now | -40.4% | -21.0% | 15.6% |
| Pop. 1990 to Now | -52.7% | -15.5% | 30.8% |
| space4 | | | |
| Population Density | 746.5 | 1,199.6 | 93.4 |
| Land Area | 1.2 | 3.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mounds, IL | Anna, IL | United States |
| Age 0 to 4 | 5.0% | 6.3% | 5.9% |
| Age 5 to 9 | 3.8% | 3.2% | 6.1% |
| Age 10 to 14 | 9.3% | 11.0% | 6.6% |
| Age 15 to 17 | 5.9% | 0.5% | 3.9% |
| Age 18 to 20 | 2.8% | 2.5% | 4.0% |
| Age 21 to 24 | 8.3% | 4.4% | 5.2% |
| Age 25 to 34 | 9.5% | 11.1% | 13.8% |
| Age 35 to 44 | 8.9% | 11.4% | 12.9% |
| Age 45 to 54 | 12.4% | 11.0% | 12.6% |
| Age 55 to 59 | 8.2% | 8.9% | 6.7% |
| Age 60 to 64 | 7.5% | 5.7% | 6.3% |
| Age 65 to 74 | 9.4% | 12.3% | 9.6% |
| Age 75 to 84 | 6.8% | 6.4% | 4.5% |
| Age 85 and over | 2.1% | 5.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mounds, IL | Anna, IL | United States |
| White | 6.1% | 93.6% | 59.4% |
| Black | 91.1% | 3.7% | 12.2% |
| Asian | 0.0% | 0.7% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 0.8% | 3.2% |
| Hispanic | 0.7% | 1.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mounds, IL | Anna, IL | United States |
| Married Population | 46.3% | 41.0% | 49.8% |
| Currently Married | 42.0% | 40.1% | 48.0% |
| Married but Separated | 4.3% | 0.9% | 1.8% |
| Single Population | 53.7% | 59.0% | 50.2% |
| Never Married | 39.6% | 27.8% | 33.8% |
| Divorced | 10.8% | 14.3% | 10.8% |
| Widowed | 3.3% | 16.9% | 5.6% |
| space5 | | | |
| Household Size | 2.54 | 2.15 | 2.60 |
| Households | 355 | 1,860 | 124,010,992 |
| Family Households | 199 | 955 | 80,755,759 |
| Married couple, w/children | 6.5% | 23.9% | 30.5% |
| Married couple, no children | 44.7% | 38.1% | 42.9% |
| Non Family Households | 156 | 905 | 43,255,233 |
| Single householder, w/children | 36.2% | 29.8% | 15.8% |
| Single householder, no children | 12.6% | 8.2% | 10.8% |