Calcutta is an unincorporated community and census-designated place in St. Clair Township, Columbiana County, Ohio, United States.

[4] Historically a rural town, Calcutta developed in the late 20th century as businesses from neighboring East Liverpool moved into larger shopping centers clustered around Ohio State Route 170.

[6] It had also been called Foulkstown after William Foulks, who built the first brick house there,[7] as well as Nineveh, after the Biblical city of the same name.

[8] Calcutta is located near the center of St. Clair Township in southeastern Columbiana County.

The CDP is bordered by Longs Run, a tributary of Little Beaver Creek, on the northwest.

The city of East Liverpool is 4 miles (6 km) to the south via St. Clair Avenue.

The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1.