The municipality is situated by the sea inside the islands Orust and Tjörn and traversed by the European route E6 and Bohus Line, in which it has three stops (Stora Höga, Stenungsund and Svenshögen).

The device in the upper half is a hydrocarbon molecule, which alludes to the petrochemical industry in the municipality.

Smaller localities (villages): The seat is located right by the European route E6 highway and the railway Bohus Line, Bohusbanan.

This is a demographic table based on Stenungsund Municipality's electoral districts in the 2022 Swedish general election sourced from SVT's election platform, in turn taken from SCB official statistics.

Its distinguished silhouette is four giant chimneys, belonging to a large power plant.