Calcutta is a census-designated place (CDP) in Columbiana County, Ohio, United States. The population was 3,491 at the 2000 census. Much of Calcutta is located on Ohio State Route 170.
Calcutta is located at 40°40′56″N 80°34′13″W / 40.68222°N 80.57028°W / 40.68222; -80.57028 (40.682271, -80.570204).
According to the United States Census Bureau, the CDP has a total area of 11.8 square miles (30.5 km²), of which, 11.8 square miles (30.4 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.17%) is water.