Ladoga is a town in Clark Township, Montgomery County, in the U.S. state of Indiana. The population was 1,081 at the 2020 census, up from 985 in 2010. Ladoga was platted in 1836 by John Myers. Myers invited his friends to help him find a name. He required that the name not end in -burg or -ville and that it would not be named after another town. He chose "La…Ladoga is a town in Clark Township, Montgomery County, in the U.S. state of Indiana. The population was 1,081 at the 2020 census, up from 985 in 2010. Ladoga was platted in 1836 by John Myers. Myers invited his friends to help him find a name. He required that the name not end in -burg or -ville and that it would not be named after another town. He chose "Ladoga" after finding Lake Ladoga on a map of Russia. In 1837, the town's post office was established, which still operates today.