High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Hamler is a village in Henry County, Ohio, United States. The population was 650 at the 2000 census. Founded in 1875 by John Hamler, Hamler is a rural farming community in Northwest Ohio about 40 miles southwest of Toledo, Ohio. It is located at the intersection of the former Baltimore and Ohio (B&O) and former Detroit, Toledo and Ironton (D,T&I) railroads and the intersection of Ohio State Route 109 and Ohio State Route 18.