Area Codes Phone Directory 312-843

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State	Major City	Time Zone
Illinois	Chicago	Central

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Example: (312) 843-5555 or 2012145555

Prefix	Primary City	Company	County	Usage	Introduced
312-843	Chicago, IL	Teleport Communications America	Cook	Landline	03/12/2014

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312-8437###

312-8438###

312-8439###