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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-640 Area Code & Prefix

(312) 640-0xxx
(312) 640-1xxx
(312) 640-2xxx
(312) 640-3xxx
(312) 640-4xxx
(312) 640-5xxx
(312) 640-6xxx
(312) 640-7xxx
(312) 640-8xxx
(312) 640-9xxx