| | Lewistown, IL | United States, IL |
| Population | 1,812 | 329,725,481 |
| Female Population | 50.2% | 50.5% |
| Male Population | 49.8% | 49.5% |
| Median Age | 41.8 | 38.4 |
| space3 | | |
| Population - 2010 | 2,380 | 309,327,143 |
| Population - 2000 | 2,522 | 285,036,114 |
| Population - 1990 | 2,572 | 251,960,433 |
| Pop. 2000 to Now | -16.9% | 15.6% |
| Pop. 1990 to Now | -18.5% | 30.8% |
| space4 | | |
| Population Density | 906.5 | 93.4 |
| Land Area | 2.0 | 3,531,905.4 |
| Water Area | 0.0 | 264,836.8 |
| space | | |
| Est. Total Population By Age | | |
| | Lewistown, IL | Lewistown, IL |
| Age 0 to 4 | 4.5% | 5.9% |
| Age 5 to 9 | 6.7% | 6.1% |
| Age 10 to 14 | 7.6% | 6.6% |
| Age 15 to 17 | 3.9% | 3.9% |
| Age 18 to 20 | 4.4% | 4.0% |
| Age 21 to 24 | 2.4% | 5.2% |
| Age 25 to 34 | 12.4% | 13.8% |
| Age 35 to 44 | 11.3% | 12.9% |
| Age 45 to 54 | 9.8% | 12.6% |
| Age 55 to 59 | 7.9% | 6.7% |
| Age 60 to 64 | 8.3% | 6.3% |
| Age 65 to 74 | 10.1% | 9.6% |
| Age 75 to 84 | 8.4% | 4.5% |
| Age 85 and over | 2.4% | 1.9% |
| space1 | | |
| Race | | |
| | Lewistown, IL | Lewistown, IL |
| White | 95.6% | 59.4% |
| Black | 0.3% | 12.2% |
| Asian | 1.4% | 5.6% |
| Native American | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% |
| Other | 0.0% | 0.4% |
| Two or More Races | 1.6% | 3.2% |
| Hispanic | 1.1% | 18.4% |
| space2 | | |
| Marriage & Family | | |
| | Lewistown, IL | Lewistown, IL |
| Married Population | 44.2% | 49.8% |
| Currently Married | 42.3% | 48.0% |
| Married but Separated | 1.9% | 1.8% |
| Single Population | 55.8% | 50.2% |
| Never Married | 28.2% | 33.8% |
| Divorced | 18.1% | 10.8% |
| Widowed | 9.6% | 5.6% |
| space5 | | |
| Household Size | 2.25 | 2.60 |
| Households | 778 | 124,010,992 |
| Family Households | 435 | 80,755,759 |
| Married couple, w/children | 21.4% | 30.5% |
| Married couple, no children | 43.7% | 42.9% |
| Non Family Households | 343 | 43,255,233 |
| Single householder, w/children | 26.0% | 15.8% |
| Single householder, no children | 9.0% | 10.8% |