| | Spiro, OK | Heavener, OK | United States |
| Population | 2,095 | 3,051 | 329,725,481 |
| Female Population | 50.8% | 47.6% | 50.5% |
| Male Population | 49.2% | 52.4% | 49.5% |
| Median Age | 37.1 | 32.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,162 | 3,440 | 309,327,143 |
| Population - 2000 | 2,227 | 3,201 | 285,036,114 |
| Population - 1990 | 2,146 | 2,601 | 251,960,433 |
| Pop. 2000 to Now | -3.3% | 3.1% | 15.6% |
| Pop. 1990 to Now | 0.4% | 26.8% | 30.8% |
| space4 | | | |
| Population Density | 907.7 | 618.1 | 93.4 |
| Land Area | 2.3 | 4.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Spiro, OK | Heavener, OK | United States |
| Age 0 to 4 | 7.0% | 9.3% | 5.9% |
| Age 5 to 9 | 6.2% | 7.3% | 6.1% |
| Age 10 to 14 | 8.3% | 7.7% | 6.6% |
| Age 15 to 17 | 4.3% | 5.8% | 3.9% |
| Age 18 to 20 | 3.4% | 5.1% | 4.0% |
| Age 21 to 24 | 6.7% | 5.0% | 5.2% |
| Age 25 to 34 | 10.5% | 13.2% | 13.8% |
| Age 35 to 44 | 14.4% | 14.5% | 12.9% |
| Age 45 to 54 | 10.6% | 10.2% | 12.6% |
| Age 55 to 59 | 6.4% | 6.6% | 6.7% |
| Age 60 to 64 | 5.6% | 4.9% | 6.3% |
| Age 65 to 74 | 10.3% | 6.9% | 9.6% |
| Age 75 to 84 | 5.4% | 2.7% | 4.5% |
| Age 85 and over | 1.0% | 0.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Spiro, OK | Heavener, OK | United States |
| White | 68.9% | 47.5% | 59.4% |
| Black | 3.0% | 0.7% | 12.2% |
| Asian | 2.4% | 1.9% | 5.6% |
| Native American | 11.3% | 7.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 7.4% | 8.4% | 3.2% |
| Hispanic | 7.0% | 34.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Spiro, OK | Heavener, OK | United States |
| Married Population | 41.9% | 46.1% | 49.8% |
| Currently Married | 39.2% | 43.7% | 48.0% |
| Married but Separated | 2.6% | 2.4% | 1.8% |
| Single Population | 58.1% | 53.9% | 50.2% |
| Never Married | 32.3% | 32.1% | 33.8% |
| Divorced | 18.8% | 14.8% | 10.8% |
| Widowed | 7.0% | 6.9% | 5.6% |
| space5 | | | |
| Household Size | 2.41 | 3.29 | 2.60 |
| Households | 849 | 908 | 124,010,992 |
| Family Households | 502 | 610 | 80,755,759 |
| Married couple, w/children | 32.9% | 35.2% | 30.5% |
| Married couple, no children | 29.9% | 28.9% | 42.9% |
| Non Family Households | 347 | 298 | 43,255,233 |
| Single householder, w/children | 22.5% | 23.3% | 15.8% |
| Single householder, no children | 14.7% | 12.6% | 10.8% |