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Phone Directory 312-637 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 637-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-637 Chicago, IL Broadwing Communications Cook Landline 05/10/1999

Other Series For Prefixes

312-6370###
312-6371###
312-6372###
312-6373###
312-6374###
312-6375###
312-6376###
312-6377###
312-6378###
312-6379###