Area Codes Phone Directory 312-520

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State	Major City	Time Zone
Illinois	Chicago	Central

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Example: (312) 520-5555 or 2012145555

Prefix	Primary City	Company	County	Usage	Introduced
312-520	Chicago, IL	Cellco Partnership DBA Verizon Wireless	Cook	Cell Number	11/11/2003

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312-5200###

312-5201###

312-5202###

312-5203###

312-5204###

312-5205###

312-5206###

312-5207###

312-5208###

312-5209###