Seiont is bordered to the north by the A4085 (Constantine Road) and Caernarfon High Street, to the northwest by the Menai Strait and is surrounded to the southeast and southwest by the Bontnewydd ward.

[4] Seiont has been an electoral ward to Gwynedd Council since 1995, electing two county councillors, a mixture of Independent, Plaid Cymru, Labour Party and Llais Gwynedd representatives.

[5] Following the death of Independent councillor Bob Anderson, a by-election was held on 7 October 2010.

It was won by Llais Gwynedd's Endaf Cooke with a majority of 120 over the Plaid Cymru candidate.

Cllr Owen made the news in 2018 when he personally filled in over 90 potholes in the ward's highways, though Gwynedd Council advised him to stop.