Monaghan County Council: 1991 Local Election
| Party | Seats | Votes | Share | Candidates | Constituencies | |||||
| Fianna Fáil |  | 8 | (-2) | 9777 | 40.1% | (-4.1%) | 12 | (-1) | 4 | |
| Fine Gael |  | 7 | 7981 | 32.8% | (-0.8%) | 9 | (-2) | 4 | ||
| Sinn Féin |  | 2 | 3396 | 13.9% | (+1.9%) | 5 | (+2) | 4 | (+1) | |
| Protestant Association |  | 2 | (+1) | 1790 | 7.3% | (+0.7%) | 2 | 2 | ||
| Independent |  | 1 | (+1) | 1174 | 4.8% | (+2.1%) | 4 | (+1) | 4 | (+1) |
| Workers' Party |  | 0 | 249 | 1.0% | (+0.3%) | 1 | 1 | |||