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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-558 Area Code & Prefix

(312) 558-0xxx
(312) 558-1xxx
(312) 558-2xxx
(312) 558-3xxx
(312) 558-4xxx
(312) 558-5xxx
(312) 558-6xxx
(312) 558-7xxx
(312) 558-8xxx
(312) 558-9xxx