county town of Pembrokeshire , Wales . Haverfordwest is the most populous urban area in Pembrokeshire, with a population of 13,367 in 2001; though its community boundaries (which exclude Merlin's Bridge) make it the second most populous settlement in the county, with 10,812 people.. Euskara: Haverfordwest/Hwlffordd Galesko hego-mendebaldean dagoen udalerria da,