Introduction
Port town in Isle of Anglesey, Wales "Caergybi" redirects here. For other uses, see Caergybi (disambiguation). For the surname, and other articles about Holyhead, see Holyhead (disambiguation). Human settlement in WalesHolyheadWelsh: CaergybiTown skylineHolyheadLocation within AngleseyPopulation12,084 2011 CensusOS grid referenceSH2482CommunityHolyheadPrincipal areaAngleseyPreserved countyGwyneddCountryWalesSovereign stateUnited KingdomPost townHOLYHEADPostcode districtLL65Dialling code01407PoliceNorth WalesFireNorth WalesAmbulanceWelsh UK ParliamentYnys MônSenedd Cymru – Welsh ParliamentBangor Conwy Môn List of places UK Wales Anglesey 53°18′32″N 4°37′59″W / 53.309°N 4.633°W / 53.309; -4.633 Map of the community Holyhead (/ˌhəʊliˈhɛd, ˌhɒliˈhɛd/; Welsh: Caergybi pronounced [kɑːɨrˈɡəbi] ⓘ, "Cybi's fort") is a historic port town, and is the largest town and a community in the county of the Isle of Anglesey, Wales. Holyhead is on Holy Island, bounded by the Irish Sea to the north, and is separated from Anglesey island by the narrow Cymyran Strait. It was originally connected to Anglesey via the Four Mile Bridge. In the mid-19th century, Lord Stanley, a local philanthropist, funded the building of a larger causeway, known locally as "the Cobb"; it now carries the A5 and the railway line. The A55 dual carriageway runs parallel to the Cobb on a modern causeway. The town houses the Port of Holyhead, a major Irish Sea port for connections towards Ireland. The population of the town proper as of the 2021 census was 12,084, an increase on the 2011 census.[better source needed]