Gypsum is an unincorporated community in eastern Portage Township, Ottawa County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 43433.
Children from Gypsum families generally attend the Port Clinton City School District. The neighborhood is considered friendly, home-spun, and mainly conservative.
The community is name for the gypsum rock, the mining of which was originally the foundation of the community's business, commerce, and population growth. Because these mines are located throughout the community and township, the area is subject to excessive erosion because of sinkholes — hence the name "sinkhole".
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