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Phone Directory 312-421 Detail
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Illinois
Chicago
Central
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Area Code Prefixes
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Introduced
312-421
Chicago, IL
Ameritech Illinois
Cook
Landline
02/04/1994
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Other Series For Prefixes
312-4210###
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312-4211###
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312-4212###
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312-4213###
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312-4214###
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312-4215###
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312-4216###
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312-4217###
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312-4218###
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312-4219###
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