If a region is divided into constituencies, the county administrative board shall decide no later than 30 April in the year when ordinary elections are held how many permanent constituency seats each constituency shall have. This shall be done in the following way.

The number of persons who are entitled to vote in the region is divided by the number of permanent constituency seats, and then the number of persons who are entitled to vote in each constituency is divided by the figure resulting from this calculation. The constituency shall receive one seat for each time that the number of persons who are entitled to vote in a constituency is evenly divisible by this figure.

If all permanent constituency seats cannot be distributed in this way, the constituencies receive the remaining seats in order of the surpluses resulting from the calculation. If the surplus figure is the same in two or more constituencies, the constituency that receives the seat shall be determined by drawing lots.

The Government or the authority that decides on alterations to the division of Sweden into regions or municipalities may, if necessary, determine that a decision on the distribution of seats may be made later than the date referred to in the first paragraph.