| | Lena, IL | Blairstown, IA | United States |
| Population | 2,854 | 726 | 329,725,481 |
| Female Population | 47.1% | 46.6% | 50.5% |
| Male Population | 52.9% | 53.4% | 49.5% |
| Median Age | 43.9 | 36 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,909 | 691 | 309,327,143 |
| Population - 2000 | 2,887 | 682 | 285,036,114 |
| Population - 1990 | 2,605 | 672 | 251,960,433 |
| Pop. 2000 to Now | -7.2% | -4.3% | 15.6% |
| Pop. 1990 to Now | 2.9% | -2.8% | 30.8% |
| space4 | | | |
| Population Density | 1,076.6 | 1,469.6 | 93.4 |
| Land Area | 2.7 | 0.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lena, IL | Blairstown, IA | United States |
| Age 0 to 4 | 5.2% | 9.9% | 5.9% |
| Age 5 to 9 | 9.3% | 5.6% | 6.1% |
| Age 10 to 14 | 6.6% | 6.2% | 6.6% |
| Age 15 to 17 | 6.4% | 2.8% | 3.9% |
| Age 18 to 20 | 0.7% | 2.1% | 4.0% |
| Age 21 to 24 | 0.4% | 4.4% | 5.2% |
| Age 25 to 34 | 10.7% | 18.6% | 13.8% |
| Age 35 to 44 | 12.2% | 15.2% | 12.9% |
| Age 45 to 54 | 12.6% | 7.7% | 12.6% |
| Age 55 to 59 | 4.6% | 8.5% | 6.7% |
| Age 60 to 64 | 8.7% | 3.9% | 6.3% |
| Age 65 to 74 | 8.6% | 6.2% | 9.6% |
| Age 75 to 84 | 9.9% | 5.8% | 4.5% |
| Age 85 and over | 4.1% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lena, IL | Blairstown, IA | United States |
| White | 94.7% | 91.6% | 59.4% |
| Black | 2.1% | 0.0% | 12.2% |
| Asian | 0.3% | 0.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 2.6% | 3.2% |
| Hispanic | 2.0% | 5.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lena, IL | Blairstown, IA | United States |
| Married Population | 66.4% | 57.2% | 49.8% |
| Currently Married | 65.6% | 56.0% | 48.0% |
| Married but Separated | 0.8% | 1.2% | 1.8% |
| Single Population | 33.6% | 42.8% | 50.2% |
| Never Married | 18.9% | 22.9% | 33.8% |
| Divorced | 7.3% | 16.2% | 10.8% |
| Widowed | 7.3% | 3.7% | 5.6% |
| space5 | | | |
| Household Size | 2.43 | 2.65 | 2.60 |
| Households | 1,147 | 274 | 124,010,992 |
| Family Households | 780 | 202 | 80,755,759 |
| Married couple, w/children | 36.5% | 23.8% | 30.5% |
| Married couple, no children | 51.8% | 52.5% | 42.9% |
| Non Family Households | 367 | 72 | 43,255,233 |
| Single householder, w/children | 11.7% | 20.8% | 15.8% |
| Single householder, no children | 0.0% | 3.0% | 10.8% |