Canlyniadau etholiad ar gyfer Porthmadog (Gorllewin)

 Annibynnol Ennill Gwilym Jones was etholwyd with a majority of 4%. Cafodd cyfanswm o 664 o bleidleisiau eu bwrw.

Table of main parties and election candidates retaining deposit

Ymgeisydd Etholiadol	Plaid	Nifer	%	Statws	% Newid
Gwilym Jones	Annibynnol	301	45%	Newly elected	n/a
Llywelyn Rhys	Plaid Cymru	275	41%	Ni etholwyd	n/a
Joe McDonald	Llafur	88	13%	Ni etholwyd	n/a