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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 312-921-0000

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)-921 Exchange

Area Code and Exchange Number Block Line Type City Zip Codes
312-921- 0000-0 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 1000-1 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 2000-2 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 3000-3 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 4000-4 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 5000-5 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 6000-6 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 7000-7 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 8000-8 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 9000-9 999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689
312-921- 0000-9999 Land line, non-wireless service CHICAGO 60606 60686 60688 60689

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