Area Codes Phone Directory 312-401

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State	Major City	Time Zone
Illinois	Chicago	Central

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Example: (312) 401-5555 or 2012145555

Prefix	Primary City	Company	County	Usage	Introduced
312-401	Chicago, IL	New Cingular Wireless PCS	Cook	Cell Number	11/11/2003

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312-4018###

312-4019###