The results of the Referendum on the Thirty-eighth Amendment of the Constitution (Dissolution of Marriage) Bill 2016, for the counties of Fingal, South Dublin and Dun Laoghaire are as follows.
| County | Electorate | Total Poll | Spoiled | Valid Poll | Votes YES | Votes NO |
| Fingal | 176,889 | 79,222 | 781 | 78,441 | 67,745 | 10,696 |
| South Dublin | 184,645 | 79,622 | 779 | 78,843 | 67,852 | 10,991 |
| Dun Laoghaire | 157,366 | 77,532 | 801 | 76,731 | 66,529 | 10,202 |
