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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-521 Area Code & Prefix

(312) 521-0xxx
(312) 521-1xxx
(312) 521-2xxx
(312) 521-3xxx
(312) 521-4xxx
(312) 521-5xxx
(312) 521-6xxx
(312) 521-7xxx
(312) 521-8xxx
(312) 521-9xxx