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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-428 Area Code & Prefix

(312) 428-0xxx
(312) 428-1xxx
(312) 428-2xxx
(312) 428-3xxx
(312) 428-4xxx
(312) 428-5xxx
(312) 428-6xxx
(312) 428-7xxx
(312) 428-8xxx
(312) 428-9xxx