 carbon is a city in douglas township, adams county, iowa, united states. the population was 34 at the 2010 census. note that other places in iowa have been named carbon. there was a carbon post office in davis county, 6 miles south of ottumwa, that operated for less than a year in 1881.iowa geographic map server there was also a carbon post office in webster county, 3 miles south-east of fort dodge, that operated from 1870 to 1872.carbon post
Cities_in_Adams_County,_Iowa Cities_in_Iowa Populated_places_established_in_1849