It originally covered all the lands on both sides of the Osterfjorden-Romarheimsfjorden from the Lonevågen fjord all the way east to the county border at the end of the Modalen valley.

Hosanger also included an exclave on the Lindås peninsula surrounding the village of Seim at the southern end of the Lurefjorden.

On 1 January 1885, the exclave of Seim was separated from Hosanger and merged into the new Alversund Municipality.

On 1 January 1867, the Øksendalen farm (population: 28) in the Eksingedalen valley was transferred from Voss Municipality to Hosanger by Royal resolution.

[5] The municipal council (Heradsstyre) of Hosanger was made up of 17 representatives that were elected to four year terms.

The party breakdown of the final municipal council was as follows: The historic Hosanger Church was built in 1796.