Wealthwood Township is a township in Aitkin County, Minnesota, United States. The population was 268 as of the 2010 census. According to the United States Census Bureau, the township has a total area of 72.6 square miles, of which 23.2 square miles is land and 49.4 square miles, or 68.09%, is water. The township is located on the north shore of Mille …Wealthwood Township is a township in Aitkin County, Minnesota, United States. The population was 268 as of the 2010 census. According to the United States Census Bureau, the township has a total area of 72.6 square miles, of which 23.2 square miles is land and 49.4 square miles, or 68.09%, is water. The township is located on the north shore of Mille Lacs Lake, the second-largest inland lake in Minnesota.