North American Area code 435 is a telephone area code which covers all of the U.S. state of Utah outside the Wasatch Front (which includes the Salt Lake City, Ogden, and Provo metropolitan areas in northern Utah). It split from the 801 area code on September 21, 1997, and includes Beaver, Brigham City, Castle Dale, Cedar City, Coalville, Duchesne, Fillmore, Heber City, Hurricane, Junction, Kanab, Loa, Logan, Manila, Manti, Moab, Monticello, Nephi, Park City, Panguitch, Parowan, Price, Randolph, Richfield, St. George, Tooele, Washington, and Vernal. Before area code 435 entered service, 801 had been Utah's sole area code for half a century. It is one of the six pairs of "donut area codes" in the numbering plan.It also is used for the Colorado City, AZ school district.