Charter Oak is a city in Crawford County, Iowa, United States, along the East Soldier River.

The Chicago, Milwaukee & St. Paul Railway was completed in February 1887, bringing the train through town twice daily as it hauled postage and freight from Manilla to Sioux City.

Articles of Incorporation were filed for the town of Charter Oak February 14, 1891.

In 1980 the freight service on the Chicago, Milwaukee, & St. Paul Railroad ended, the rail line was removed, and the station was sold.

According to the United States Census Bureau, the city has a total area of 0.48 square miles (1.24 km2), all land.

[4] Iowa Highway 141 As of the census of 2020,[6] there were 535 people, 234 households, and 126 families residing in the city.

There were 252 housing units at an average density of 490.9 per square mile (189.5/km2).

There were 268 housing units at an average density of 558.3 per square mile (215.6/km2).

41.5% of all households were made up of individuals, and 18.3% had someone living alone who was 65 years of age or older.

37.6% of all households were made up of individuals, and 23.3% had someone living alone who was 65 years of age or older.