Hemlock is a village in Perry County, Ohio, United States. The population was 142 at the 2020 census. The village was originally settled as Coaldale on June 15, 1869, and established as Hemlock on July 15, 1872. A post office was in operation until October 3, 1986. Hemlock is home to the Southern Local School District, Miller High School and Millcreek Eleā¦Hemlock is a village in Perry County, Ohio, United States. The population was 142 at the 2020 census. The village was originally settled as Coaldale on June 15, 1869, and established as Hemlock on July 15, 1872. A post office was in operation until October 3, 1986. Hemlock is home to the Southern Local School District, Miller High School and Millcreek Elementary School.