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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-504 Area Code & Prefix

(312) 504-0xxx
(312) 504-1xxx
(312) 504-2xxx
(312) 504-3xxx
(312) 504-4xxx
(312) 504-5xxx
(312) 504-6xxx
(312) 504-7xxx
(312) 504-8xxx
(312) 504-9xxx