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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-231 Area Code & Prefix

(312) 231-0xxx
(312) 231-1xxx
(312) 231-2xxx
(312) 231-3xxx
(312) 231-4xxx
(312) 231-5xxx
(312) 231-6xxx
(312) 231-7xxx
(312) 231-8xxx
(312) 231-9xxx