| | Lanark, IL | Bloomington, IL | United States |
| Population | 1,571 | 78,372 | 329,725,481 |
| Female Population | 51.9% | 50.5% | 50.5% |
| Male Population | 48.1% | 49.5% | 49.5% |
| Median Age | 43.4 | 35.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,459 | 76,809 | 309,327,143 |
| Population - 2000 | 1,584 | 64,808 | 285,036,114 |
| Population - 1990 | 1,382 | 51,972 | 251,960,433 |
| Pop. 2000 to Now | -16.6% | 19.0% | 15.6% |
| Pop. 1990 to Now | -4.4% | 48.4% | 30.8% |
| space4 | | | |
| Population Density | 1,396.4 | 2,887.4 | 93.4 |
| Land Area | 1.1 | 27.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lanark, IL | Bloomington, IL | United States |
| Age 0 to 4 | 7.0% | 6.7% | 5.9% |
| Age 5 to 9 | 10.0% | 6.0% | 6.1% |
| Age 10 to 14 | 4.5% | 6.0% | 6.6% |
| Age 15 to 17 | 0.9% | 3.9% | 3.9% |
| Age 18 to 20 | 4.1% | 5.5% | 4.0% |
| Age 21 to 24 | 4.6% | 7.1% | 5.2% |
| Age 25 to 34 | 8.8% | 14.3% | 13.8% |
| Age 35 to 44 | 14.0% | 13.6% | 12.9% |
| Age 45 to 54 | 11.0% | 12.1% | 12.6% |
| Age 55 to 59 | 8.9% | 6.4% | 6.7% |
| Age 60 to 64 | 5.4% | 5.5% | 6.3% |
| Age 65 to 74 | 11.8% | 8.4% | 9.6% |
| Age 75 to 84 | 7.3% | 3.4% | 4.5% |
| Age 85 and over | 1.6% | 1.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lanark, IL | Bloomington, IL | United States |
| White | 93.3% | 73.1% | 59.4% |
| Black | 1.5% | 9.3% | 12.2% |
| Asian | 0.0% | 8.5% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 1.8% | 2.9% | 3.2% |
| Hispanic | 3.2% | 5.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lanark, IL | Bloomington, IL | United States |
| Married Population | 54.5% | 49.2% | 49.8% |
| Currently Married | 54.3% | 48.2% | 48.0% |
| Married but Separated | 0.2% | 1.0% | 1.8% |
| Single Population | 45.5% | 50.8% | 50.2% |
| Never Married | 30.0% | 36.5% | 33.8% |
| Divorced | 9.7% | 10.0% | 10.8% |
| Widowed | 5.8% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 2.52 | 2.30 | 2.60 |
| Households | 617 | 33,090 | 124,010,992 |
| Family Households | 421 | 18,848 | 80,755,759 |
| Married couple, w/children | 28.0% | 33.9% | 30.5% |
| Married couple, no children | 49.2% | 44.8% | 42.9% |
| Non Family Households | 196 | 14,242 | 43,255,233 |
| Single householder, w/children | 16.2% | 14.4% | 15.8% |
| Single householder, no children | 6.7% | 6.9% | 10.8% |