Sông Cầu is a town of Phú Yên Province in the South Central Coast region of Vietnam.After Vietnam War, Sông Cầu was merged into Đồng Xuân District in 1976. The latter was then combined with Tuy An District to become Xuân An District in March 1977, but Xuân An was soon split again into the two previous districts in September 1978. Sông Cầu Township was the seat for those districts. On 27 June 1985, Sông Cầu District was split from Đồng Xuân District. On 28 August 2009, the whole Sông Cầu District was upgraded into Sông Cầu Town.Sông Cầu Town is subdivided into 4 wards and 10 communes . At the time of establishment, it has a population of 101,521 and covers an area of 489.28 km². The local government's offices are located in Xuân Phú Ward.