| | Klamath, CA | Springboro, OH | United States |
| Population | 946 | 18,831 | 329,725,481 |
| Female Population | 53.7% | 50.3% | 50.5% |
| Male Population | 46.3% | 49.7% | 49.5% |
| Median Age | 48.9 | 36.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 893 | 17,403 | 309,327,143 |
| Population - 2000 | 651 | 12,380 | 285,036,114 |
| Population - 1990 | 827 | 6,590 | 251,960,433 |
| Pop. 2000 to Now | 14.0% | 55.4% | 15.6% |
| Pop. 1990 to Now | -10.3% | 191.9% | 30.8% |
| space4 | | | |
| Population Density | 76.3 | 2,018.1 | 93.4 |
| Land Area | 12.4 | 9.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Klamath, CA | Springboro, OH | United States |
| Age 0 to 4 | 5.1% | 8.2% | 5.9% |
| Age 5 to 9 | 7.6% | 7.4% | 6.1% |
| Age 10 to 14 | 7.0% | 7.2% | 6.6% |
| Age 15 to 17 | 5.4% | 5.9% | 3.9% |
| Age 18 to 20 | 1.8% | 2.6% | 4.0% |
| Age 21 to 24 | 2.9% | 3.4% | 5.2% |
| Age 25 to 34 | 8.0% | 11.9% | 13.8% |
| Age 35 to 44 | 10.1% | 12.9% | 12.9% |
| Age 45 to 54 | 12.8% | 14.4% | 12.6% |
| Age 55 to 59 | 5.0% | 5.0% | 6.7% |
| Age 60 to 64 | 8.1% | 4.5% | 6.3% |
| Age 65 to 74 | 11.7% | 11.2% | 9.6% |
| Age 75 to 84 | 12.4% | 4.0% | 4.5% |
| Age 85 and over | 2.1% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Klamath, CA | Springboro, OH | United States |
| White | 49.9% | 91.1% | 59.4% |
| Black | 0.0% | 0.8% | 12.2% |
| Asian | 0.2% | 2.5% | 5.6% |
| Native American | 32.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.3% | 2.8% | 3.2% |
| Hispanic | 14.3% | 2.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Klamath, CA | Springboro, OH | United States |
| Married Population | 47.4% | 67.4% | 49.8% |
| Currently Married | 44.5% | 66.7% | 48.0% |
| Married but Separated | 2.9% | 0.7% | 1.8% |
| Single Population | 52.6% | 32.6% | 50.2% |
| Never Married | 22.8% | 19.3% | 33.8% |
| Divorced | 15.4% | 8.8% | 10.8% |
| Widowed | 14.5% | 4.5% | 5.6% |
| space5 | | | |
| Household Size | 2.67 | 2.81 | 2.60 |
| Households | 352 | 6,661 | 124,010,992 |
| Family Households | 240 | 5,470 | 80,755,759 |
| Married couple, w/children | 20.0% | 43.2% | 30.5% |
| Married couple, no children | 43.3% | 43.2% | 42.9% |
| Non Family Households | 112 | 1,191 | 43,255,233 |
| Single householder, w/children | 25.0% | 9.6% | 15.8% |
| Single householder, no children | 11.7% | 4.0% | 10.8% |