Dún Laoghaire–Rathdown was divided into six local electoral areas (LEAs) to elect councillors for a five-year term of office on the electoral system of proportional representation by means of the single transferable vote (PR-STV).

[1][2] Its terms of reference required no change in the total number of councillors but set a lower maximum LEA size of seven councillors, requiring a change to the eight-seat Dún Laoghaire LEA.

Fine Gael remained the largest party gaining an additional 2 seats while seeing a slight reduction in vote-share.

Fianna Fáil lost a seat in Stillorgan to return 7 in total and saw a slight reduction in vote share.

The main winners in Dún Laoghaire were the Greens who won 6 seats and saw all 6 of their candidates elected in the process.