| | Fairborn, OH | Chillicothe, OH | United States |
| Population | 34,398 | 22,047 | 329,725,481 |
| Female Population | 50.9% | 52.3% | 50.5% |
| Male Population | 49.1% | 47.7% | 49.5% |
| Median Age | 34.9 | 41.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 33,147 | 21,902 | 309,327,143 |
| Population - 2000 | 32,052 | 21,796 | 285,036,114 |
| Population - 1990 | 31,300 | 21,923 | 251,960,433 |
| Pop. 2000 to Now | 6.1% | -0.7% | 15.6% |
| Pop. 1990 to Now | 8.6% | -1.3% | 30.8% |
| space4 | | | |
| Population Density | 2,362.3 | 2,115.4 | 93.4 |
| Land Area | 14.6 | 10.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fairborn, OH | Chillicothe, OH | United States |
| Age 0 to 4 | 7.0% | 6.2% | 5.9% |
| Age 5 to 9 | 5.4% | 5.7% | 6.1% |
| Age 10 to 14 | 4.3% | 6.7% | 6.6% |
| Age 15 to 17 | 2.7% | 2.3% | 3.9% |
| Age 18 to 20 | 4.3% | 2.9% | 4.0% |
| Age 21 to 24 | 8.8% | 4.7% | 5.2% |
| Age 25 to 34 | 17.6% | 11.2% | 13.8% |
| Age 35 to 44 | 13.5% | 14.2% | 12.9% |
| Age 45 to 54 | 9.6% | 12.3% | 12.6% |
| Age 55 to 59 | 6.4% | 5.9% | 6.7% |
| Age 60 to 64 | 5.0% | 7.2% | 6.3% |
| Age 65 to 74 | 7.8% | 11.8% | 9.6% |
| Age 75 to 84 | 5.6% | 6.0% | 4.5% |
| Age 85 and over | 2.0% | 2.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fairborn, OH | Chillicothe, OH | United States |
| White | 78.8% | 84.3% | 59.4% |
| Black | 8.5% | 7.8% | 12.2% |
| Asian | 1.7% | 0.2% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.3% | 0.4% |
| Two or More Races | 7.1% | 6.0% | 3.2% |
| Hispanic | 3.6% | 1.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fairborn, OH | Chillicothe, OH | United States |
| Married Population | 43.9% | 45.5% | 49.8% |
| Currently Married | 41.8% | 43.4% | 48.0% |
| Married but Separated | 2.1% | 2.1% | 1.8% |
| Single Population | 56.1% | 54.5% | 50.2% |
| Never Married | 36.8% | 28.6% | 33.8% |
| Divorced | 13.4% | 18.0% | 10.8% |
| Widowed | 5.9% | 7.8% | 5.6% |
| space5 | | | |
| Household Size | 2.18 | 2.23 | 2.60 |
| Households | 15,501 | 9,534 | 124,010,992 |
| Family Households | 8,211 | 5,294 | 80,755,759 |
| Married couple, w/children | 25.4% | 25.1% | 30.5% |
| Married couple, no children | 44.2% | 40.8% | 42.9% |
| Non Family Households | 7,290 | 4,240 | 43,255,233 |
| Single householder, w/children | 20.9% | 23.0% | 15.8% |
| Single householder, no children | 9.5% | 11.1% | 10.8% |