The Miami metropolitan area anchors a region commonly referred to by local inhabitants as South Florida; it is the metropolitan area comprising Miami, Florida and nearby communities. The U.S. Office of Management and Budget designates the area as the Miami-Fort Lauderdale-West Palm Beach, FL Metropolitan Statistical Area, a Metropolitan Statistical Area (MSA) used for statistical purposes by the United States Census Bureau and other entities. The OMB defines the MSA as comprising Miami-Dade, Broward, and Palm Beach counties—Florida's three most populous counties—with principal cities including Miami, Fort Lauderdale, Pompano Beach, West Palm Beach, and Boca Raton. The Combined Statistical Area, consisting of the three counties, as well as St. Lucie, Martin, Indian River, and Okeechobee counties; adding these four counties to the metro area, the combined area's population racks up to 6,444,610. Principal cities added by the combined area are: Port St. Lucie, Fort Pierce, and Sebastian.