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Area code 385 is a relatively recent addition to the North American Numbering Plan, officially established in 2009. It serves as a geographic overlay for the area code 801, covering the greater Salt Lake City region in Utah. This designation allows for a single area code to accommodate an increasing demand for telephone numbers due to the area's rapid population growth and economic development.

Historically, area code 801 was the sole area code in Utah until it became one of the first in the United States to implement an overlay code. With the introduction of 385, residents and businesses in the region can maintain existing 801 numbers while new customers receive 385 codes, which helps alleviate the pressure on the numbering system.

The area code's geographical span includes major urban centers like Salt Lake City, Provo, and Ogden, along with several surrounding communities. Unique to the area code system, the use of both 801 and 385 allows for a diverse range of number exchanges and services, including traditional landlines and an increasing number of mobile devices. This dual-system structure supports a robust telecommunications infrastructure, ensuring that Utah's growing population can access essential communication services efficiently.

Notably, 385 numbers may require 10-digit dialing within the region, a result of the overlay system, which has become standard practice in many densely populated areas across the United States.