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Phone Directory 312-921 Detail
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Illinois
Chicago
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Area Code Prefixes
Prefix
Primary City
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Introduced
312-921
Chicago, IL
Ameritech Illinois
Cook
Landline
07/21/2008
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Other Series For Prefixes
312-9210###
Search Complaints
312-9211###
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312-9212###
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312-9213###
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312-9214###
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312-9215###
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312-9216###
Search Complaints
312-9217###
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312-9218###
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312-9219###
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