City of Cedar Hill. City of Cedar Hill Prospective settlers who traveled to this area during the 19th century were attracted to its high prairie hill and established a community here known as Cedar Hill in the late 1840s. Its early economy was based on providing support services for the surrounding farm communities. Cedar Hill was struck by a disastrous tornado in 1856, which slowed growth until the railroad came through in 1882. The town experienced a transition from rural to urban development during the late 20th century. It remains one of Dallas County's oldest settlements. #6642