 Fort Pierce is located at (27.438817, -80.335471).According to the U. S. Census Bureau, the city has a total area of 20.8 mi2 (53.8 km2), of which 14.7 square miles (38.2 km2) is land and 6.0 square miles (15.6 km2) of it (35.00%) is water.According to the U.S. Army Corps of Engineers, The Fort Pierce Beach Shore Protection project includes 1.3 miles of shore line running from immediately south of the Fort Pierce Inlet southward to Surfside Park.