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. Locally the tri-county region is referred to as the South Florida region or megalopolis.