Jacksonville Beach is a coastal resort city in Duval County, Florida, United States. It was incorporated on May 22, 1907, as Pablo Beach, and would later change its name to Jacksonville Beach in 1925. The city is part of group of communities collectively referred to as the Jacksonville Beaches. These communities include Mayport, Atlantic Beach, Neptune Beach, and Ponte Vedra Beach. When the city of Jacksonville consolidated with Duval County in 1968, Jacksonville Beach, together with Atlantic Beach, Neptune Beach, and Baldwin, voted to retain their own municipal governments. As a result, citizens of Jacksonville Beach are also eligible to vote in mayoral election for the City of Jacksonville. As of the 2010 census, Jacksonville Beach had a total population of 21,362.
The area around present-day Jacksonville Beach was first settled by Spanish settlers. Spanish missions were established from Mayport to St. Augustine. Spain ceded Florida to Great Britain by treaty in 1763, only to have Spain regain it again, and then a final time in 1821 to the United States.