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Area code 521 is a code format intended for personal communications services.
The 521 area code is nonspecific to any geographic area.
It was first put into service in September 2017.
The 5XX format was introduced after the 522 code filled up, starting with 521 and continuing all the way to 529. Area code 523 has been in use since November 2012 and 524 was put into service in July 2019.
Area Code 521 Extensions