Carman lies on along the Mississippi River across from Burlington, Iowa.

Due to its proximity to the river, parts of Carman frequently flood.

According to the 2021 census gazetteer files, Carman has a total area of 0.41 square miles (1.06 km2), all land.

[5] As of the 2020 census[6] there were 67 people, 91 households, and 85 families residing in the CDP.

6.59% of all households were made up of individuals, and 0.00% had someone living alone who was 65 years of age or older.