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Phone Directory 312-978 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 978-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-978 Chicago, IL T-mobile Usa Cook Cell Number 10/22/2013

Other Series For Prefixes

312-9780###
312-9781###
312-9782###
312-9783###
312-9784###
312-9785###
312-9786###
312-9787###
312-9788###
312-9789###