Mapleton is a city in Monona County, Iowa, United States. The population was 1,416 at the 2000 census.
Mapleton is located at 42°9′51″N 95°47′28″W / 42.16417°N 95.79111°W / 42.16417; -95.79111 (42.164049, -95.791110). It is situated on the Maple River.
According to the United States Census Bureau, the city has a total area of 1.6 square miles (4.2 km²), all of it land.