If a municipality has 36 000 people or more who are entitled to vote, the municipality may be divided into two or more constituencies. A municipality that has less than 36 000 people who are entitled to vote may only be divided into two or more constituencies if there are extraordinary reasons to do so.

The number of persons entitled to vote shall be estimated on the basis of the information contained in the population registration database under the Act on the Processing of Personal Data in the Swedish Tax Agency’s Population Registration Operations (2001:182) on 1 March in the year when the decision on division of constituencies is made.

A constituency should be formed so that it is expected to have at least 13 permanent constituency seats. It shall have a continuous boundary line, unless there are extraordinary reasons for doing otherwise.