Jupiter Island is a barrier island on the coast of Martin and Palm Beach counties, Florida. It is bounded on the east by the Atlantic Ocean, on the north by the St. Lucie Inlet, on the west by the Indian River, and on the south by the Jupiter Inlet. Jupiter Island originally was two islands, Long Island on the north and Jupiter Island on the south, which were once separated by an inlet in the vicinity of North Jupiter Narrows and what is officially called Peck Lake, but commonly called Peck's Lake.

Palm Beach County is a county in the southeastern part of Florida, located in the Miami metropolitan area. It is Florida's third-most populous county after Miami-Dade County and Broward County and the 26th-most populous in the United States, with 1,492,191 residents as of the 2020 census. Its county seat and largest city is West Palm Beach, which had a population of 117,415 as of 2020. Named after one of its oldest settlements, Palm Beach, the county was established in 1909, after being split from Miami-Dade County. The county's modern-day boundaries were established in 1963.