Hemlock is a village in Saltlick Township, Perry County, Ohio, United States. The population was 142 at the 2020 census. The Village was …Hemlock is a village in Saltlick Township, Perry County, Ohio, United States. The population was 142 at the 2020 census. The Village was originally settled as Coaldale on June 15, 1869 then established as Hemlock on July 15, 1872. A Post Office was in operation until the early 2000s.