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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-721 Area Code & Prefix

(312) 721-0xxx
(312) 721-1xxx
(312) 721-2xxx
(312) 721-3xxx
(312) 721-4xxx
(312) 721-5xxx
(312) 721-6xxx
(312) 721-7xxx
(312) 721-8xxx
(312) 721-9xxx