Area code 435

The state of Utah was a single numbering plan area, with area code 801, when the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan in 1947.

On September 21, 1997, the 801 numbering plan area was geographically reduced to just a four-county area around and including Salt Lake City to provide more telephone numbers in that region.

This numbering plan area 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.

The area code is also used for the Colorado City, AZ school district.

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.