Area Codes Phone Directory 312-643

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State	Major City	Time Zone
Illinois	Chicago	Central

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Example: (312) 643-5555 or 2012145555

Prefix	Primary City	Company	County	Usage	Introduced
312-643	Chicago, IL	Rcn Telecom Services Of Illinois	Cook	Landline	01/25/1998

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312-6431###

312-6432###

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312-6437###

312-6438###

312-6439###