The City of Williamston Comprehensive Development Plan was prepared by the City of Williamston Planning Commission with the technical assistance of Tri-County Regional Planning Committee and Land Planning and Design Association in October 1976.

The Master Plan for Wheatfield Township was prepared by the Wheatfield Township Planning Commission and was adopted on March 25, 1976.

The Master Plan for Stockbridge Township was prepared by Robert B. Totaling, PCP#2 and was revised in February 1990.

The Leroy Township Master Plan was prepared by the Leroy Township Planning Commission with the assistance of McKenna Associates, Incorporated and was adopted on March 26, 1996.