This is a list of municipality numbers used in Norway. The numbers originate from 1946, when four-digit codes based on ISO 3166-2:NO were assigned to each municipality. This also applied to municipalities which had ceased to exist at the time. Urban municipalities got a municipality number in which the third digit was a zero. Note that this list is still needed for historical purposes, and will have to be copied to a new article prior to any change in numbering due to recent county reforms.