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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-399 Area Code & Prefix

(312) 399-0xxx
(312) 399-1xxx
(312) 399-2xxx
(312) 399-3xxx
(312) 399-4xxx
(312) 399-5xxx
(312) 399-6xxx
(312) 399-7xxx
(312) 399-8xxx
(312) 399-9xxx