St. Joseph, often called St. Joe, is a town in, and the parish seat of, rural Tensas Parish in northeastern Louisiana, United States, in the delta of …St. Joseph, often called St. Joe, is a town in, and the parish seat of, rural Tensas Parish in northeastern Louisiana, United States, in the delta of the Mississippi River. The population was 1,176 at the 2010 census. The town had an African-American majority of 77.4 percent in 2010.