Watsco is the biggest rival of Johnstone Supply. Watsco was founded in 1956, and its headquarters is in Miami, Florida. Watsco operates in the Construction Supplies & Fittings industry. Watsco has 1,780 more employees than Johnstone Supply.
Young Supply has been one of Johnstone Supply's top competitors. Young Supply is a Private company that was founded in Chesterfield, Michigan in 1935. Young Supply is in the Industrial Machinery & Equipment industry. Young Supply has 5,300 fewer employees vs. Johnstone Supply.