Gaerwen is a village on the island of Anglesey, Wales. It is located in the south of the island 4 miles (6.4 km) west of Llanfairpwllgwyngyll and 4 miles (6.4 km) southeast of Llangefni . The A5 runs through the village, and the A55 runs just a few hundred metres north. According to the 2011 Census Gaerwen is now listed by the Office for National Statistics as Llanfihangel Ysgeifiog. The population of this community was 1,551.