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Phone Directory 312-503 Detail
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Illinois
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Area Code Prefixes
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Introduced
312-503
Chicago, IL
Broadwing Communications
Cook
Landline
02/04/1994
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Other Series For Prefixes
312-5030###
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312-5031###
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312-5032###
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312-5033###
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312-5034###
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312-5035###
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312-5036###
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312-5037###
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312-5038###
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312-5039###
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