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A map of Utah with the 801 and 385 area code overlay in red and area code 435 in white.

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 "doughnut area codes" in the numbering plan.

435 is one of the most thinly populated area codes in the nation; the great majority of Utah's population–and with it, most of its landlines and cell phones–is located along the Wasatch Front. As a result, 435 is nowhere near exhaustion. The most recent NANPA projections does not list an exhaust date for 435, explaining that the projected exhaust date is more than 30 years in the future. [1]

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Utah area codes: 385/801, 435
North: 208, 307
West: 775 Area Code 435 (totally surrounds 385/801) East: 307, 970
South: 928
Arizona area codes: 480, 520, 602, 623, 928
Colorado area codes: 303/720, 719, 970
Idaho area codes: 208
Nevada area codes: 702/725, 775
Wyoming area codes: 307

Coordinates: 39°30′N 111°30′W / 39.5°N 111.5°W / 39.5; -111.5