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Phone Directory 312-204 Detail
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Illinois
Chicago
Central
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Area Code Prefixes
Prefix
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Introduced
312-204
Chicago, IL
Ameritech Illinois
Cook
Landline
10/11/1997
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Other Series For Prefixes
312-2040###
Search Complaints
312-2041###
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312-2042###
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312-2043###
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312-2044###
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312-2045###
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312-2046###
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312-2047###
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312-2048###
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312-2049###
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