Silver Lake is a town in Lake Township, Kosciusko County, in the U.S. state of Indiana. The population was 915 at the 2010 census. Silver Lake was originally called Silver Lakeville, and under the latter name was platted in 1859. The community's location near Silver Lake caused the name to be selected. The post office at Silver Lake has been in oper…Silver Lake is a town in Lake Township, Kosciusko County, in the U.S. state of Indiana. The population was 915 at the 2010 census. Silver Lake was originally called Silver Lakeville, and under the latter name was platted in 1859. The community's location near Silver Lake caused the name to be selected. The post office at Silver Lake has been in operation since 1854.