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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-304 Area Code & Prefix

(312) 304-0xxx
(312) 304-1xxx
(312) 304-2xxx
(312) 304-3xxx
(312) 304-4xxx
(312) 304-5xxx
(312) 304-6xxx
(312) 304-7xxx
(312) 304-8xxx
(312) 304-9xxx