St Just is a town and civil parish in the Penwith district of Cornwall, England, United Kingdom. It lies along the B3306 road which connects St Ives to the A30 road. The parish encompasses the town of St Just and the nearby settlements of Trewellard, Pendeen and Kelynack: it is bounded by the parishes of Morvah to the north-east, Sancreed and Madron to the east, St Buryan and Sennen to the south and by the sea in the west. The parish consists of 7622acre of land, 12acre of water and 117acre of foreshore. The town of St Just is the most westerly town in mainland Britain and is situated approximately 8mi west of Penzance along the A3071. St Just parish, which includes Pendeen and the surrounding area, has a population of 4690 . An electoral ward also exists: the population of this ward at the same census was 4,812.St Just lies within the Cornwall Area of Outstanding Natural Beauty . Almost a third of Cornwall has AONB designation, with the same status and protection as a National Park. St Just is one of only two towns included within the Cornwall AONB.