Before (end of 1990) (42 seats, Elections Centre)
Other 20 · Labour 11 · Liberal Democrats 7 · Conservative 3 · Plaid Cymru - The Party of Wales 1
After (end of 1991) (42 seats, Elections Centre)
Other 23 · Labour 13 · Liberal Democrats 3 · Plaid Cymru - The Party of Wales 2 · Conservative 1
Ward results
Trelawnyd & Gwaenysgor1 seat
| P Glynn-Heeson | Labour | 318 |
| C. Broughton | Independent | 56 |