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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-578 Area Code & Prefix

(312) 578-0xxx
(312) 578-1xxx
(312) 578-2xxx
(312) 578-3xxx
(312) 578-4xxx
(312) 578-5xxx
(312) 578-6xxx
(312) 578-7xxx
(312) 578-8xxx
(312) 578-9xxx