West Palm Beach is a city in and the county seat of Palm Beach County, Florida, United States. It is located immediately to the west of the adjacent Palm Beach, which is situated on a barrier island across the Lake Worth Lagoon. The population was 99,919 at the 2010 census. West Palm Beach is a principal city of the Miami metropolitan area, which was home to an estimated 6,158,824 people in 2017.It is the oldest incorporated municipality in the south Florida area, having been incorporated as a city two years before Miami in November 1894. West Palm Beach is located approximately 68 miles (109 km) north of Downtown Miami.