Elections to Newry and Mourne District Council were held on 17 May 1989 on the same day as the other Northern Irish local government elections. The election used five district electoral areas to elect a total of 30 councillors.
<small>Note: "Votes" are the first preference votes.</small>
|- class="unsortable" align="centre" !rowspan=2 align="left"|Ward ! % <br /> !Cllrs<br /> ! % <br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> ! %<br /> !Cllrs<br /> !rowspan=2|Total<br />Cllrs<br /> |- class="unsortable" align="center" !colspan=2 bgcolor="" | <span style="color:black;">SDLP</span> !colspan=2 bgcolor="" | <span style="color:black;">UUP</span> !colspan=2 bgcolor="" | <span style="color:black;">Sinn Féin</span> !colspan=2 bgcolor="white"| <span style="black;">Others</span> |- |align="left"|Crotlieve |bgcolor="#99FF66"|64.5 |bgcolor="#99FF66"|5 |20.8 |1 |4.2 |0 |10.5 |1 |7 |- |align="left"|Newry Town |bgcolor="#99FF66"|47.2 |bgcolor="#99FF66"|4 |10.4 |1 |14.6 |1 |27.8 |1 |7 |- |align="left"|Slieve Gullion |bgcolor="#99FF66"|57.1 |bgcolor="#99FF66"|3 |0.0 |0 |39.4 |2 |3.5 |0 |5 |- |align="left"|The Fews |bgcolor="#99FF66"|43.5 |bgcolor="#99FF66"|3 |31.9 |2 |15.4 |1 |9.2 |0 |6 |- |align="left"|The Mournes |bgcolor="#99FF66"|32.4 |bgcolor="#99FF66"|2 |26.0 |2 |3.1 |0 |38.5 |1 |5 |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |49.4 |17 |18.5 |6 |14.0 |4 |18.1 |3 |30 |-
1985: 4 x SDLP, 2 x UUP, 1 x Independent Nationalist<br /> 1989: 5 x SDLP, 1 x UUP, 1 x Independent Nationalist<br /> 1985-1989 Change: SDLP gain from UUP
1985: 4 x SDLP, 1 x Sinn Féin, 1 x UUP, 1 x IIP<br /> 1989: 4 x SDLP, 1 x Sinn Féin, 1 x UUP, 1 x Independent Nationalist<br /> 1985-1989 Change: Independent Nationalist leaves IIP
1985: 3 x SDLP, 2 x Sinn Féin<br /> 1989: 3 x SDLP, 2 x Sinn Féin<br /> 1985-1989 Change: No change
1985: 3 x SDLP, 2 x UUP, 1 x Sinn Féin<br /> 1989: 2 x SDLP, 2 x UUP, 1 x Sinn Féin, 1 x DUP<br /> 1985-1989 Change: SDLP gain from DUP
1985: 2 x UUP, 1 x SDLP, 1 x DUP, 1 x Sinn Féin<br /> 1989: 2 x UUP, 2 x SDLP, 1 x Protestant Unionist<br /> 1985-1989 Change: SDLP gain from Sinn Féin, Protestant Unionist leaves DUP