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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-278 Area Code & Prefix

(312) 278-0xxx
(312) 278-1xxx
(312) 278-2xxx
(312) 278-3xxx
(312) 278-4xxx
(312) 278-5xxx
(312) 278-6xxx
(312) 278-7xxx
(312) 278-8xxx
(312) 278-9xxx