| | Lowell, IN | Rensselaer, IN | United States |
| Population | 10,569 | 5,963 | 329,725,481 |
| Female Population | 51.8% | 52.3% | 50.5% |
| Male Population | 48.2% | 47.7% | 49.5% |
| Median Age | 37.5 | 37.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,314 | 5,993 | 309,327,143 |
| Population - 2000 | 7,505 | 5,294 | 285,036,114 |
| Population - 1990 | 6,430 | 5,045 | 251,960,433 |
| Pop. 2000 to Now | 35.1% | 9.2% | 15.6% |
| Pop. 1990 to Now | 57.7% | 14.6% | 30.8% |
| space4 | | | |
| Population Density | 1,727.5 | 906.4 | 93.4 |
| Land Area | 6.1 | 6.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lowell, IN | Rensselaer, IN | United States |
| Age 0 to 4 | 8.1% | 5.8% | 5.9% |
| Age 5 to 9 | 6.5% | 7.5% | 6.1% |
| Age 10 to 14 | 7.9% | 7.5% | 6.6% |
| Age 15 to 17 | 5.9% | 3.3% | 3.9% |
| Age 18 to 20 | 2.2% | 3.4% | 4.0% |
| Age 21 to 24 | 3.9% | 4.2% | 5.2% |
| Age 25 to 34 | 13.4% | 15.1% | 13.8% |
| Age 35 to 44 | 12.0% | 11.9% | 12.9% |
| Age 45 to 54 | 11.5% | 12.5% | 12.6% |
| Age 55 to 59 | 4.1% | 6.2% | 6.7% |
| Age 60 to 64 | 4.2% | 5.8% | 6.3% |
| Age 65 to 74 | 15.6% | 10.3% | 9.6% |
| Age 75 to 84 | 3.6% | 4.5% | 4.5% |
| Age 85 and over | 1.1% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lowell, IN | Rensselaer, IN | United States |
| White | 86.9% | 87.9% | 59.4% |
| Black | 0.2% | 1.8% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 0.7% | 2.8% | 3.2% |
| Hispanic | 12.0% | 7.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lowell, IN | Rensselaer, IN | United States |
| Married Population | 58.8% | 47.0% | 49.8% |
| Currently Married | 57.2% | 46.6% | 48.0% |
| Married but Separated | 1.5% | 0.4% | 1.8% |
| Single Population | 41.2% | 53.0% | 50.2% |
| Never Married | 26.9% | 25.3% | 33.8% |
| Divorced | 6.6% | 20.9% | 10.8% |
| Widowed | 7.7% | 6.8% | 5.6% |
| space5 | | | |
| Household Size | 2.63 | 2.37 | 2.60 |
| Households | 3,982 | 2,427 | 124,010,992 |
| Family Households | 2,837 | 1,339 | 80,755,759 |
| Married couple, w/children | 42.8% | 31.7% | 30.5% |
| Married couple, no children | 37.3% | 39.1% | 42.9% |
| Non Family Households | 1,145 | 1,088 | 43,255,233 |
| Single householder, w/children | 11.2% | 19.7% | 15.8% |
| Single householder, no children | 8.7% | 9.5% | 10.8% |