| | Janesville, IA | Batesville, AR | United States |
| Population | 1,059 | 11,117 | 329,725,481 |
| Female Population | 47.5% | 49.5% | 50.5% |
| Male Population | 52.5% | 50.5% | 49.5% |
| Median Age | 40.9 | 37.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 932 | 10,349 | 309,327,143 |
| Population - 2000 | 829 | 9,445 | 285,036,114 |
| Population - 1990 | 822 | 9,187 | 251,960,433 |
| Pop. 2000 to Now | 20.1% | 14.7% | 15.6% |
| Pop. 1990 to Now | 21.2% | 17.9% | 30.8% |
| space4 | | | |
| Population Density | 725.8 | 958.8 | 93.4 |
| Land Area | 1.5 | 11.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Janesville, IA | Batesville, AR | United States |
| Age 0 to 4 | 7.1% | 7.8% | 5.9% |
| Age 5 to 9 | 7.8% | 5.6% | 6.1% |
| Age 10 to 14 | 5.9% | 7.2% | 6.6% |
| Age 15 to 17 | 5.9% | 2.8% | 3.9% |
| Age 18 to 20 | 1.6% | 4.6% | 4.0% |
| Age 21 to 24 | 0.3% | 6.7% | 5.2% |
| Age 25 to 34 | 12.9% | 11.5% | 13.8% |
| Age 35 to 44 | 14.3% | 15.3% | 12.9% |
| Age 45 to 54 | 11.8% | 9.2% | 12.6% |
| Age 55 to 59 | 13.3% | 6.2% | 6.7% |
| Age 60 to 64 | 3.9% | 6.6% | 6.3% |
| Age 65 to 74 | 10.1% | 8.4% | 9.6% |
| Age 75 to 84 | 4.2% | 3.9% | 4.5% |
| Age 85 and over | 0.9% | 4.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Janesville, IA | Batesville, AR | United States |
| White | 98.4% | 71.9% | 59.4% |
| Black | 0.0% | 5.1% | 12.2% |
| Asian | 0.0% | 0.9% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 0.4% | 4.1% | 3.2% |
| Hispanic | 1.2% | 17.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Janesville, IA | Batesville, AR | United States |
| Married Population | 67.7% | 44.9% | 49.8% |
| Currently Married | 67.1% | 42.8% | 48.0% |
| Married but Separated | 0.6% | 2.0% | 1.8% |
| Single Population | 32.3% | 55.1% | 50.2% |
| Never Married | 22.9% | 30.3% | 33.8% |
| Divorced | 3.8% | 16.1% | 10.8% |
| Widowed | 5.6% | 8.8% | 5.6% |
| space5 | | | |
| Household Size | 2.47 | 2.45 | 2.60 |
| Households | 428 | 4,209 | 124,010,992 |
| Family Households | 307 | 2,279 | 80,755,759 |
| Married couple, w/children | 37.8% | 36.9% | 30.5% |
| Married couple, no children | 54.7% | 37.3% | 42.9% |
| Non Family Households | 121 | 1,930 | 43,255,233 |
| Single householder, w/children | 3.6% | 17.9% | 15.8% |
| Single householder, no children | 3.9% | 7.9% | 10.8% |