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Indiana Office of Utility Consumer Counselor

OUCC > Telecommunications > Cases of Note > 317 Area Code Relief: Changes Are Coming 317 Area Code Relief: Changes Are Coming

The 317 telephone area code serving Indianapolis and most of its suburbs is low on available numbers and is projected to run out in late 2016. As a result, the new 463 area code will be added.

  • The Indiana Utility Regulatory Commission (IURC) has approved the use of the "all-services overlay" method for adding the new code. This means the new area code will be assigned only to new telephone numbers. Anyone with a 317 phone number will keep it. To allow that to happen, all local calls in the 317 area will eventually require ten-digit dialing, most likely starting in September 2016.
  • The telecommunications industry and the Indiana Office of Utility Consumer Counselor (OUCC) both recommended the all-services overlay approach.
  • The OUCC issued a September 24, 2014 news release to invite public comments and to publicize the five public field hearings held in the fall of 2014. The hearings were held in Indianapolis, Carmel, Franklin, Danville, and Greenfield.  

All new area codes introduced in the United States since 2008 have used the overlay method, including the new 930 area code which now overlays the 812 code throughout southern, south-central and western Indiana. 

With the overlay: 

  • All consumers with 317 phone numbers will keep them, with no changes.
  • In late 2016, numbers for new telephone customers will be assigned with the new area code.
  • All customers will dial ten digits for local calls (area code + number), though local calling areas will not change. Calls that are currently local will remain local.
  • Toll calls will still use eleven digits (1 + area code + number).
  • A transition period (expected to last from March 19, 2016 until September 17, 2016) will allow consumers to adjust to 10-digit dialing and make any needed changes. Ten-digit dialing is expected to become mandatory on September 17, 2016.
  • Businesses, not-for-profit organizations, government agencies and other customers will not need to incur costs for reprinting signage, stationery, advertising, or business cards because of the area code change. However, 7-digit numbers in fax machines, alarm systems, and other devices and systems will need to be reprogrammed to include the area codes.

For more information on the 317 case:

For more information, in general:

This page will be updated based on future developments.

6-10-15