Runoff elections for mayors and district administrators were held on 27 September where necessary.
Voters have one vote, which is cast for both a constituency candidate and associated party list.
Local boards and the Ruhr Parliament are elected via pure party-list proportional representation with a 2.5% threshold.
Elections to a single position, such as mayors and district administrators, are conducted via the two-round system.
[1] The number of members on each district and city/municipal council is determined by the number of residents it serves, and may vary between 20 and 90 members, not counting overhang and leveling seats that can emerge during elections.