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PHONE NUMBER PREFIXES IN THE 312 AREA CODE

Thousand digits 312-550 Area Code & Prefix

(312) 550-0xxx
(312) 550-1xxx
(312) 550-2xxx
(312) 550-3xxx
(312) 550-4xxx
(312) 550-5xxx
(312) 550-6xxx
(312) 550-7xxx
(312) 550-8xxx
(312) 550-9xxx