Area Codes Phone Directory 312-304

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State	Major City	Time Zone
Illinois	Chicago	Central

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Example: (312) 304-5555 or 2012145555

Prefix	Primary City	Company	County	Usage	Introduced
312-304	Hinsdale, IL	New Cingular Wireless PCS	Dupage	Cell Number	02/11/1995

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312-3040###

312-3041###

312-3042###

312-3043###

312-3044###

312-3045###

312-3046###

312-3047###

312-3048###

312-3049###