Postal service came to Sabula, Iowa’s only island town, in July 1837 under the moniker Carl Port. The post office station was quickly renamed to Charleston before a final change to Sabula in February 1846. The town’s first postmaster was William H. Brown, with mail delivery three times each week from the route between Dubuque and Davenport. The post office occupied a half-dozen different locations before moving to its present site in 1996.