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Phone Directory 312-521 Detail
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Illinois
Chicago
Central
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Area Code Prefixes
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Introduced
312-521
Chicago, IL
AT&T Local
Cook
Landline
01/25/1998
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Other Series For Prefixes
312-5210###
Search Complaints
312-5211###
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312-5212###
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312-5213###
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312-5214###
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312-5215###
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312-5216###
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312-5217###
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312-5218###
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312-5219###
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