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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-400 Area Code & Prefix

(312) 400-0xxx
(312) 400-1xxx
(312) 400-2xxx
(312) 400-3xxx
(312) 400-4xxx
(312) 400-5xxx
(312) 400-6xxx
(312) 400-7xxx
(312) 400-8xxx
(312) 400-9xxx