Dún Laoghaire–Rathdown County Council: 1991 Local Election
| Party | Seats | Votes | Share | Candidates | Constituencies | |||||
| Fianna Fáil |  | 8 | (-5) | 17833 | 30.3% | (-7.8%) | 21 | (-2) | 7 | |
| Fine Gael |  | 7 | (-4) | 14007 | 23.8% | (-10.3%) | 16 | (-6) | 7 | |
| Labour Party |  | 5 | (+2) | 7437 | 12.6% | (+0.5%) | 7 | (-7) | 7 | |
| Green Party |  | 3 | (+3) | 6737 | 11.4% | (+11.5%) | 10 | (+10) | 7 | (+7) |
| Workers' Party |  | 3 | (+2) | 6390 | 10.9% | (+6.2%) | 7 | (+1) | 6 | |
| Progressive Democrats |  | 2 | (+2) | 4823 | 8.2% | (+8.2%) | 6 | (+6) | 5 | (+5) |
| Independent |  | 0 | 947 | 1.6% | (-1.9%) | 4 | (-4) | 3 | (-1) | |
| Sinn Féin |  | 0 | 688 | 1.2% | (-2.0%) | 1 | (-2) | 1 | (-2) | |