2018 Nyköping municipal election

Nyköping Municipality held a municipal election on 9 September 2018, on the same day as the general and regional elections.

Results
The number of seats remained at 61 with the Social Democrats winning the most at 20, a drop of two from 2014.

Electoral wards
There were three constituencies, the Eastern, Northern and Western. The number of late-incoming postal ballots were 704 or 1.9% of the total ballots cast.