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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-670 Area Code & Prefix

(312) 670-0xxx
(312) 670-1xxx
(312) 670-2xxx
(312) 670-3xxx
(312) 670-4xxx
(312) 670-5xxx
(312) 670-6xxx
(312) 670-7xxx
(312) 670-8xxx
(312) 670-9xxx