Forest Township is a township in Rice County, Minnesota, United States. The population was 1,136 at the 2000 census. The unincorporated community of Millersburg is located within Forest Township. According to the United States Census Bureau, the township has a total area of 35.7 square miles, of which 32.7 square miles is land and 3.0 square mileā¦Forest Township is a township in Rice County, Minnesota, United States. The population was 1,136 at the 2000 census. The unincorporated community of Millersburg is located within Forest Township. According to the United States Census Bureau, the township has a total area of 35.7 square miles, of which 32.7 square miles is land and 3.0 square miles is water.