| | Oil City, LA | Texarkana, AR | United States |
| Population | 924 | 29,492 | 329,725,481 |
| Female Population | 58.6% | 51.7% | 50.5% |
| Male Population | 41.5% | 48.4% | 49.5% |
| Median Age | 42.7 | 40.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,010 | 29,965 | 309,327,143 |
| Population - 2000 | 1,219 | 26,448 | 285,036,114 |
| Population - 1990 | 1,282 | 22,631 | 251,960,433 |
| Pop. 2000 to Now | -21.4% | 11.8% | 15.6% |
| Pop. 1990 to Now | -25.3% | 30.6% | 30.8% |
| space4 | | | |
| Population Density | 518.2 | 704.1 | 93.4 |
| Land Area | 1.8 | 41.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Oil City, LA | Texarkana, AR | United States |
| Age 0 to 4 | 5.4% | 6.0% | 5.9% |
| Age 5 to 9 | 5.3% | 6.9% | 6.1% |
| Age 10 to 14 | 9.4% | 6.3% | 6.6% |
| Age 15 to 17 | 4.2% | 3.8% | 3.9% |
| Age 18 to 20 | 2.7% | 4.2% | 4.0% |
| Age 21 to 24 | 2.1% | 3.9% | 5.2% |
| Age 25 to 34 | 16.2% | 14.2% | 13.8% |
| Age 35 to 44 | 5.8% | 12.2% | 12.9% |
| Age 45 to 54 | 10.3% | 12.9% | 12.6% |
| Age 55 to 59 | 10.9% | 7.1% | 6.7% |
| Age 60 to 64 | 9.0% | 5.8% | 6.3% |
| Age 65 to 74 | 11.7% | 10.0% | 9.6% |
| Age 75 to 84 | 4.0% | 5.2% | 4.5% |
| Age 85 and over | 2.9% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Oil City, LA | Texarkana, AR | United States |
| White | 50.5% | 56.5% | 59.4% |
| Black | 36.9% | 35.0% | 12.2% |
| Asian | 0.3% | 0.1% | 5.6% |
| Native American | 0.0% | 1.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 4.1% | 2.3% | 3.2% |
| Hispanic | 7.9% | 4.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Oil City, LA | Texarkana, AR | United States |
| Married Population | 24.9% | 43.6% | 49.8% |
| Currently Married | 22.2% | 39.9% | 48.0% |
| Married but Separated | 2.7% | 3.6% | 1.8% |
| Single Population | 75.1% | 56.4% | 50.2% |
| Never Married | 42.1% | 33.4% | 33.8% |
| Divorced | 19.5% | 15.7% | 10.8% |
| Widowed | 13.4% | 7.4% | 5.6% |
| space5 | | | |
| Household Size | 2.09 | 2.48 | 2.60 |
| Households | 442 | 11,381 | 124,010,992 |
| Family Households | 198 | 7,204 | 80,755,759 |
| Married couple, w/children | 15.2% | 18.5% | 30.5% |
| Married couple, no children | 28.8% | 40.7% | 42.9% |
| Non Family Households | 244 | 4,177 | 43,255,233 |
| Single householder, w/children | 27.8% | 27.9% | 15.8% |
| Single householder, no children | 28.3% | 13.0% | 10.8% |