| | Strawn, IL | Marseilles, IL | United States |
| Population | 69 | 4,384 | 329,725,481 |
| Female Population | 55.1% | 51.2% | 50.5% |
| Male Population | 44.9% | 48.8% | 49.5% |
| Median Age | 44.6 | 42.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 99 | 5,094 | 309,327,143 |
| Population - 2000 | 104 | 4,655 | 285,036,114 |
| Population - 1990 | 132 | 4,811 | 251,960,433 |
| Pop. 2000 to Now | -11.5% | 2.6% | 15.6% |
| Pop. 1990 to Now | -30.3% | -0.7% | 30.8% |
| space4 | | | |
| Population Density | 135.3 | 483.5 | 93.4 |
| Land Area | 0.5 | 9.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Strawn, IL | Marseilles, IL | United States |
| Age 0 to 4 | 0.0% | 6.6% | 5.9% |
| Age 5 to 9 | 4.3% | 3.9% | 6.1% |
| Age 10 to 14 | 5.8% | 10.1% | 6.6% |
| Age 15 to 17 | 11.6% | 4.3% | 3.9% |
| Age 18 to 20 | 0.0% | 1.1% | 4.0% |
| Age 21 to 24 | 5.8% | 2.1% | 5.2% |
| Age 25 to 34 | 13.0% | 11.5% | 13.8% |
| Age 35 to 44 | 11.6% | 14.4% | 12.9% |
| Age 45 to 54 | 18.8% | 15.1% | 12.6% |
| Age 55 to 59 | 13.0% | 5.2% | 6.7% |
| Age 60 to 64 | 7.2% | 5.7% | 6.3% |
| Age 65 to 74 | 5.8% | 10.7% | 9.6% |
| Age 75 to 84 | 2.9% | 7.1% | 4.5% |
| Age 85 and over | 0.0% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Strawn, IL | Marseilles, IL | United States |
| White | 100.0% | 90.4% | 59.4% |
| Black | 0.0% | 0.3% | 12.2% |
| Asian | 0.0% | 2.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 0.0% | 1.5% | 3.2% |
| Hispanic | 0.0% | 4.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Strawn, IL | Marseilles, IL | United States |
| Married Population | 53.2% | 55.4% | 49.8% |
| Currently Married | 50.0% | 55.4% | 48.0% |
| Married but Separated | 3.2% | 0.0% | 1.8% |
| Single Population | 46.8% | 44.6% | 50.2% |
| Never Married | 33.9% | 19.8% | 33.8% |
| Divorced | 9.7% | 16.5% | 10.8% |
| Widowed | 3.2% | 8.4% | 5.6% |
| space5 | | | |
| Household Size | 2.23 | 2.40 | 2.60 |
| Households | 31 | 1,802 | 124,010,992 |
| Family Households | 19 | 1,188 | 80,755,759 |
| Married couple, w/children | 42.1% | 27.4% | 30.5% |
| Married couple, no children | 36.8% | 53.9% | 42.9% |
| Non Family Households | 12 | 614 | 43,255,233 |
| Single householder, w/children | 10.5% | 13.0% | 15.8% |
| Single householder, no children | 10.5% | 5.7% | 10.8% |