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Exchange Details

Line Type Land line, non-wireless service
Provider Name AMERITECH ILLINOIS AT&T ILLINOIS AT&T Inc (Formerly SBC Communications)
Cities in Area Code 312-300-0000

Chicago

Metropolitan Statisitical Areas in Area Code 312

Chicago, Naperville, Joliet

Counties in Area Code 312

Cook

States / Provinces

Illinois

*Approximate area serviced by the 312 area code

Phone Number Blocks in the (312)-300 Exchange

Area Code and Exchange Number Block Line Type City Zip Codes
312-300- 0000-9999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689

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