For the floor cushion, see Hassock.Hassocks is a large village and civil parish in the Mid Sussex district of West Sussex, England. Its name is believed to derive from the tufts of grass found in the surrounding fields.Located approximately 7 miles (11 km) north of Brighton, with a population of 6,821, the area now occupied by Hassocks was just a collection of small houses and a coaching house until the 19th century, when work started on the London to Brighton railway.