| | Kennedale, TX | Duncanville, TX | United States |
| Population | 8,342 | 40,575 | 329,725,481 |
| Female Population | 49.0% | 52.0% | 50.5% |
| Male Population | 51.0% | 48.0% | 49.5% |
| Median Age | 43.9 | 37.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,792 | 38,617 | 309,327,143 |
| Population - 2000 | 5,850 | 36,081 | 285,036,114 |
| Population - 1990 | 4,096 | 35,748 | 251,960,433 |
| Pop. 2000 to Now | 47.4% | 5.8% | 15.6% |
| Pop. 1990 to Now | 110.5% | 6.8% | 30.8% |
| space4 | | | |
| Population Density | 1,263.9 | 3,622.1 | 93.4 |
| Land Area | 6.6 | 11.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Kennedale, TX | Duncanville, TX | United States |
| Age 0 to 4 | 4.9% | 6.5% | 5.9% |
| Age 5 to 9 | 5.0% | 6.4% | 6.1% |
| Age 10 to 14 | 7.9% | 9.0% | 6.6% |
| Age 15 to 17 | 2.9% | 4.8% | 3.9% |
| Age 18 to 20 | 2.8% | 4.9% | 4.0% |
| Age 21 to 24 | 5.2% | 3.6% | 5.2% |
| Age 25 to 34 | 11.6% | 11.2% | 13.8% |
| Age 35 to 44 | 10.6% | 13.1% | 12.9% |
| Age 45 to 54 | 17.8% | 11.3% | 12.6% |
| Age 55 to 59 | 6.9% | 6.1% | 6.7% |
| Age 60 to 64 | 8.4% | 7.2% | 6.3% |
| Age 65 to 74 | 10.2% | 10.3% | 9.6% |
| Age 75 to 84 | 4.4% | 3.9% | 4.5% |
| Age 85 and over | 1.2% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Kennedale, TX | Duncanville, TX | United States |
| White | 57.2% | 23.4% | 59.4% |
| Black | 14.9% | 31.0% | 12.2% |
| Asian | 6.2% | 1.6% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.2% | 0.4% |
| Two or More Races | 2.8% | 1.1% | 3.2% |
| Hispanic | 18.6% | 42.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Kennedale, TX | Duncanville, TX | United States |
| Married Population | 54.9% | 50.2% | 49.8% |
| Currently Married | 54.2% | 47.7% | 48.0% |
| Married but Separated | 0.7% | 2.5% | 1.8% |
| Single Population | 45.1% | 49.8% | 50.2% |
| Never Married | 26.0% | 33.3% | 33.8% |
| Divorced | 13.2% | 10.5% | 10.8% |
| Widowed | 5.9% | 6.0% | 5.6% |
| space5 | | | |
| Household Size | 2.76 | 2.90 | 2.60 |
| Households | 3,000 | 13,912 | 124,010,992 |
| Family Households | 2,321 | 10,114 | 80,755,759 |
| Married couple, w/children | 31.4% | 28.0% | 30.5% |
| Married couple, no children | 45.6% | 39.0% | 42.9% |
| Non Family Households | 679 | 3,798 | 43,255,233 |
| Single householder, w/children | 11.8% | 19.8% | 15.8% |
| Single householder, no children | 11.1% | 13.2% | 10.8% |