If you are looking for a telephone number in Bangor then start here. The local STD code is 01248 and the postcode is LL57. The nearest library is Bangor Public Library, Ffordd Gwynedd, Bangor, Gwynedd County LL57 1DT 01248 353479 ? . Bangor is located in the county of North wales, Search White Pages Bangor to find people.