Area Codes Phone Directory 312-320

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State	Major City	Time Zone
Illinois	Chicago	Central

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Example: (312) 320-5555 or 2012145555

Prefix	Primary City	Company	County	Usage	Introduced
312-320	Chicago, IL	New Cingular Wireless PCS	Cook	Cell Number	11/11/2003

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312-3200###

312-3201###

312-3202###

312-3203###

312-3204###

312-3205###

312-3206###

312-3207###

312-3208###

312-3209###