It was created as Manger formannskapsdistrikt in 1837. On 1 January 1871 the district Herdla with 2,484 inhabitants split away to form a municipality of its own, and on 1 January 1910 the same thing happened with Hjelme. The splits left Manger with a population of 4,453. Manger was to be divided again on 1 July 1924, when the new municipalities Bø and Sæbø were created. After this final split Manger had a population of 1,426.
On 1 January 1964 Manger was merged with Hordabø and parts of Herdla, Sæbø, Lindås and Austrheim to form the new municipality Radøy. Prior to the merger Hordabø had 1,344 inhabitants.