(population: 11,200) is a town in the north-western Netherlands
, in the province of North Holland
. The municipality covers an area of 41.68 km²
(of which 0.31 km² water).
The municipality of Opmeer also includes the following towns, villages and townships: Aartswoud, De Weere, Gouwe, Hoogwoud, Spanbroek, Wadway, Zandwerven.