Gypsum is an unincorporated community in eastern Portage Township, Ottawa County, Ohio, United States.

[4] Children from Gypsum families generally attend the Port Clinton City School District.

[6] In the 1970s, after switched to processing synthetic gypsum, the company abandoned the mine, which eventually flooded.

[6] As of 2013, USG manufactures sheetrock drywall and ready-mixed joint compound at the plant, employing 230 people, down from 380 in 2004.

[5][7] In 2013, the mine, which remained abandoned for over 40 years began collapsing as water dissolved some of the underground gypsum rock, primarily calcium sulfate, resulting in depressions and sinkholes in the area.