St. Stephens is an unincorporated census-designated place in Washington County, Alabama, United States. Its population is 580. Located near the Tombigbee River in the southwestern part of the state and 67 miles north of Mobile, it is composed of two distinct sites: Old St. Stephens and New St. Stephens. The Old St. Stephens site lies directly on the river and is no longer inhabited. It was the territorial capital of the Alabama Territory. Now encompassed by the Old St. Stephens Historical Park, it is listed on the National Register of Historic Places.