The Federal Emergency Management Agency (FEMA) has derived 452 Coastal Shoreline Counties. FEMA's 100-year flood plain, or Special Flood Hazard Area (SFHA), delineates where the National Flood Insurance Program's floodplain management regulations must be enforced and the area where the mandatory purchase of flood insurance applies. The Coastal Shoreline Counties are counties that have a coastline bordering the open ocean, or contain FEMA identified coastal high hazard areas in the SFHA. American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, the U.S. Virgin Islands, and Puerto Rico are included in this suite. For more detailed information about Coastal Shoreline Counties visit: http://coastalsocioeconomics.noaa.gov/coast_defined.html