| | Charter Oak, IA | United States, IA |
| Population | 576 | 329,725,481 |
| Female Population | 47.7% | 50.5% |
| Male Population | 52.3% | 49.5% |
| Median Age | 44.1 | 38.4 |
| space3 | | |
| Population - 2010 | 505 | 309,327,143 |
| Population - 2000 | 530 | 285,036,114 |
| Population - 1990 | 497 | 251,960,433 |
| Pop. 2000 to Now | -9.8% | 15.6% |
| Pop. 1990 to Now | -3.8% | 30.8% |
| space4 | | |
| Population Density | 1,192.6 | 93.4 |
| Land Area | 0.5 | 3,531,905.4 |
| Water Area | 0.0 | 264,836.8 |
| space | | |
| Est. Total Population By Age | | |
| | Charter Oak, IA | Charter Oak, IA |
| Age 0 to 4 | 9.4% | 5.9% |
| Age 5 to 9 | 4.7% | 6.1% |
| Age 10 to 14 | 12.2% | 6.6% |
| Age 15 to 17 | 5.4% | 3.9% |
| Age 18 to 20 | 0.3% | 4.0% |
| Age 21 to 24 | 3.8% | 5.2% |
| Age 25 to 34 | 5.0% | 13.8% |
| Age 35 to 44 | 11.8% | 12.9% |
| Age 45 to 54 | 9.7% | 12.6% |
| Age 55 to 59 | 5.2% | 6.7% |
| Age 60 to 64 | 8.0% | 6.3% |
| Age 65 to 74 | 10.9% | 9.6% |
| Age 75 to 84 | 10.2% | 4.5% |
| Age 85 and over | 3.3% | 1.9% |
| space1 | | |
| Race | | |
| | Charter Oak, IA | Charter Oak, IA |
| White | 94.1% | 59.4% |
| Black | 0.0% | 12.2% |
| Asian | 0.0% | 5.6% |
| Native American | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% |
| Other | 0.0% | 0.4% |
| Two or More Races | 0.0% | 3.2% |
| Hispanic | 5.4% | 18.4% |
| space2 | | |
| Marriage & Family | | |
| | Charter Oak, IA | Charter Oak, IA |
| Married Population | 47.8% | 49.8% |
| Currently Married | 47.3% | 48.0% |
| Married but Separated | 0.5% | 1.8% |
| Single Population | 52.2% | 50.2% |
| Never Married | 22.8% | 33.8% |
| Divorced | 20.5% | 10.8% |
| Widowed | 8.9% | 5.6% |
| space5 | | |
| Household Size | 2.63 | 2.60 |
| Households | 219 | 124,010,992 |
| Family Households | 121 | 80,755,759 |
| Married couple, w/children | 27.3% | 30.5% |
| Married couple, no children | 46.3% | 42.9% |
| Non Family Households | 98 | 43,255,233 |
| Single householder, w/children | 24.8% | 15.8% |
| Single householder, no children | 1.7% | 10.8% |