Marina Village of Boynton Beach. Boynton Beach is a city in Palm Beach County, Florida, United States. The population was 68,217 at the 2010 census. In 2006, the city had a population of 66,714 according to the University of Florida, Bureau of Economic and Business Research. Boynton Beach is a principal city of the Miami metropolitan area, which was home to an estimated 6,012,331 people at the 2015 census.