 SR 704 was established in the 1945 renumbering.The road was not designated as a state road in the pre-1945 system, and only known as a local road called Okeechobee Road.County Road 704A (CR 704A) is the official designation of Australian Avenue, a partially limited access road connecting SR 708 (Blue Heron Boulevard) in Riviera Beach with US 98/SR 80 (Southern Boulevard) and SR 807 (Congress Avenue) in Glen Ridge.