Keystone is an unincorporated community in Chester Township, Wells County, in the U.S. state of Indiana.

[1] A large share of the early settlers being natives of Pennsylvania caused the name of Keystone to be selected, after the Keystone State.

[3] The post office at Keystone has been in operation since 1871.

The United States Census Bureau delineated Keystone as a census designated place in the 2022 American Community Survey.

This Wells County, Indiana location article is a stub.