|Population||3,038 (2011 census)|
|Sovereign state||United Kingdom|
4 (Town Council)
The Seiont ward covers an area either side of the Afon Seiont in the southern part of the community. The ward includes the southern part of Caernarfon town centre, including Caernarfon Castle, Caernarfon railway station and the housing estates south of the A4085.
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.
Gwynedd county ward
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. Cooke retained his seat at the May 2012 county council election.
At the 2017 elections Plaid Cymru regained their seat.
|Independent||W. Roy OWEN *||563||28.2|
|Plaid Cymru||Olaf Cai LARSEN||282||14.1|
|Llais Gwynedd||Endaf COOKE *||251||12.6|
|Plaid Cymru||Glyn TOMOS||248||12.4|
|Independent||Arfon Lewis JONES||176||8.8|
* = sitting councillor prior to the election
Seiont's Independent councillor Roy Owen was leader of the Independent group for ten years on the county council, until he resigned from the group in May 2017 to form the Gwynedd United Independents. 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.
- "Election Maps GB". Ordnance Survey. Retrieved 25 April 2019.
- "Seiont - Key Stats". UKcensusdata.com. Retrieved 25 April 2019.
- "Councillors". Caernarfon Royal Town Council. Retrieved 25 April 2019.
- "Arfon Welsh District Council Election Results 1973–1991" (PDF). The Elections Centre (Plymouth University). Retrieved 25 April 2019.
- "Gwynedd Council Election Results 1995-2012" (PDF). The Elections Centre (Plymouth University). Retrieved 25 April 2019.
- "'Pob un ward' o fewn gafael Llais Gwynedd". Golwg360 (in Welsh). 8 October 2010. Retrieved 25 April 2019.
- "Election results for Seiont (Caernarfon): Local Government Elections 2017 - Thursday, 4th May, 2017". Gwynedd Council. Retrieved 25 April 2019.
- Hywel Trewyn (17 May 2017). "Ex-Gwynedd group leader declares independence from Independents to set up new party". North Wales Live. Retrieved 25 April 2019.
- Hywel Trewyn (8 May 2018). "Meet the man who's taking Caernarfon pothole problem into his own hands". North Wales Live. Retrieved 25 April 2019.