The Mongstad industrial area lies along the border of Austrheim and neighboring Lindås municipality.

On 1 January 1947, all of the islands located west of the Fedjefjorden (population: 920) were separated to form the new Fedje Municipality.

The official blazon is "Azure, three bars embowed argent" (Norwegian: På blå grunn tre sølv bjelkar bøygde oppover).

This means the arms have a blue field (background) and the ordinary is a set of three arched bars.

The bars have a tincture of argent which means they are commonly colored white, but if the arms are made out of metal, then silver is used.

The tables below show the current and historical composition of the council by political party.

It is the largest oil port and refinery in Norway, is responsible for about 70% of all wet bulk.

It is located south of the Fensfjorden, east of the Fedjefjorden, north of the island of Radøy, and west of the Lindås peninsula.