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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-421 Area Code & Prefix

(312) 421-0xxx
(312) 421-1xxx
(312) 421-2xxx
(312) 421-3xxx
(312) 421-4xxx
(312) 421-5xxx
(312) 421-6xxx
(312) 421-7xxx
(312) 421-8xxx
(312) 421-9xxx