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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-778 Area Code & Prefix

(312) 778-0xxx
(312) 778-1xxx
(312) 778-2xxx
(312) 778-3xxx
(312) 778-4xxx
(312) 778-5xxx
(312) 778-6xxx
(312) 778-7xxx
(312) 778-8xxx
(312) 778-9xxx