Elections to Castlereagh Borough Council were held on 17 May 1989 on the same day as the other Northern Irish local government elections. The election used three district electoral areas to elect a total of 21 councillors.
Election results
Note: "Votes" are the first preference votes.
Districts summary
|- class="unsortable" align="centre" !rowspan=2 align="left"|Ward ! % !Cllrs ! % !Cllrs ! % !Cllrs ! % !Cllrs ! % !Cllrs !rowspan=2|TotalCllrs |- class="unsortable" align="center" !colspan=2 bgcolor="" | DUP !colspan=2 bgcolor="" | UUP !colspan=2 bgcolor="" | Alliance !colspan=2 bgcolor="" | UPUP !colspan=2 bgcolor="white"| Others |- |align="left"|Castlereagh Central |bgcolor="#D46A4C"|60.1 |bgcolor="#D46A4C"|4 |20.0 |2 |19.9 |1 |0.0 |0 |0.0 |0 |7 |- |align="left"|Castlereagh East |bgcolor="#D46A4C"|43.7 |bgcolor="#D46A4C"|3 |14.7 |1 |18.1 |1 |9.2 |1 |14.3 |1 |7 |- |align="left"|Castlereagh South |32.8 |2 |bgcolor="40BFF5"|42.0 |bgcolor="40BFF5"|3 |25.2 |2 |0.0 |0 |0.0 |0 |7 |- class="unsortable" class="sortbottom" style="background:#C9C9C9" |align="left"| Total |45.0 |9 |27.0 |6 |21.5 |4 |2.5 |1 |4.0 |1 |21
Districts results
Castlereagh Central
1985: 4 x DUP, 2 x UUP, 1 x Alliance 1989: 4 x DUP, 2 x UUP, 1 x Alliance 1985-1989 Change: No change
Castlereagh East
1985: 3 x DUP, 3 x UUP, 1 x Alliance 1989: 3 x DUP, 1 x Alliance, 1 x UUP, 1 x UPUP, 1 x Independent Unionist 1985-1989 Change: UPUP and Independent Unionist gain from UUP (two seats)
Castlereagh South
1985: 3 x DUP, 3 x UUP, 1 x Alliance 1989: 3 x UUP, 2 x DUP, 2 x Alliance 1985-1989 Change: Alliance gain from DUP
References