| | Martinsville, IN | Elwood, IN | United States |
| Population | 11,848 | 8,295 | 329,725,481 |
| Female Population | 49.1% | 54.2% | 50.5% |
| Male Population | 51.0% | 45.8% | 49.5% |
| Median Age | 36.3 | 40.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,974 | 8,603 | 309,327,143 |
| Population - 2000 | 11,698 | 9,737 | 285,036,114 |
| Population - 1990 | 11,677 | 9,494 | 251,960,433 |
| Pop. 2000 to Now | 1.0% | -14.0% | 15.6% |
| Pop. 1990 to Now | 1.1% | -11.7% | 30.8% |
| space4 | | | |
| Population Density | 2,616.0 | 2,231.0 | 93.4 |
| Land Area | 4.5 | 3.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Martinsville, IN | Elwood, IN | United States |
| Age 0 to 4 | 6.2% | 7.3% | 5.9% |
| Age 5 to 9 | 6.6% | 4.3% | 6.1% |
| Age 10 to 14 | 6.8% | 6.6% | 6.6% |
| Age 15 to 17 | 3.7% | 4.1% | 3.9% |
| Age 18 to 20 | 3.0% | 3.1% | 4.0% |
| Age 21 to 24 | 7.5% | 8.1% | 5.2% |
| Age 25 to 34 | 14.8% | 10.5% | 13.8% |
| Age 35 to 44 | 12.9% | 14.3% | 12.9% |
| Age 45 to 54 | 10.2% | 13.1% | 12.6% |
| Age 55 to 59 | 8.2% | 6.8% | 6.7% |
| Age 60 to 64 | 5.6% | 6.5% | 6.3% |
| Age 65 to 74 | 8.1% | 8.0% | 9.6% |
| Age 75 to 84 | 4.5% | 5.7% | 4.5% |
| Age 85 and over | 1.9% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Martinsville, IN | Elwood, IN | United States |
| White | 96.2% | 93.4% | 59.4% |
| Black | 0.5% | 0.6% | 12.2% |
| Asian | 0.5% | 0.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.0% | 1.2% | 3.2% |
| Hispanic | 1.8% | 4.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Martinsville, IN | Elwood, IN | United States |
| Married Population | 47.0% | 41.2% | 49.8% |
| Currently Married | 45.8% | 39.6% | 48.0% |
| Married but Separated | 1.2% | 1.6% | 1.8% |
| Single Population | 53.0% | 58.8% | 50.2% |
| Never Married | 28.0% | 29.1% | 33.8% |
| Divorced | 16.6% | 22.4% | 10.8% |
| Widowed | 8.3% | 7.3% | 5.6% |
| space5 | | | |
| Household Size | 2.55 | 2.53 | 2.60 |
| Households | 4,418 | 3,276 | 124,010,992 |
| Family Households | 2,838 | 2,138 | 80,755,759 |
| Married couple, w/children | 32.9% | 20.6% | 30.5% |
| Married couple, no children | 38.3% | 40.8% | 42.9% |
| Non Family Households | 1,580 | 1,138 | 43,255,233 |
| Single householder, w/children | 17.7% | 20.1% | 15.8% |
| Single householder, no children | 11.2% | 18.4% | 10.8% |