317 Area Code Relief


Although the Federal Communications Commission (FCC) has broad jurisdiction over telephone number issues, it delegates authority to the states on how to introduce new area codes. Therefore, when a petition is filed with the Indiana Regulatory Commission (Commission), the agency does not determine whether to implement area code relief; rather, it decides how it should be done based on the evidence presented.

On July 10, 2014, the North American Numbering Plan Administration (NANPA) filed a petition for relief in the 317 area code. According to the most recent projections by the NANPA, the 317 area code serving central Indiana is expected to run out of assignable telephone numbers in the fourth quarter of 2016. The NANPA files its petition on behalf of the industry when an area code is three years away from exhaust: Petition in Cause No. 44513

To view frequently asked questions about area code relief, please click here.

The map below shows the 317 area code along with county and rate center boundaries.

317 Area Code Field Hearings

The Commission held five field hearings in 2014 in which interested parties could speak directly to the Commission regarding the 317 area code relief. The field hearings were held on:

Sep. 26, 2014, 10:00 a.m.- PNC Center, 101 W. Washington Street, Room 224, Indianapolis, IN 46204

Oct. 1 2014, 6 p.m.- Carmel Clay School District Office, Board Room, 5201 E. Main Street, Carmel, IN 46033

Oct. 14, 2014, 6 p.m.- Franklin College Student Center, Branigin Room, 101 Branigin Boulevard, Franklin, IN 46131.

Oct. 29, 2014, 6 p.m.- Danville High School Auditorium, 100 Warrior Way, Danville, IN 46122

Dec. 1, 2014, 6 p.m.- Greenfield City Hall, Council Chambers, 10 S. State Street, Greenfield, IN 46140


On April 8, 2015, the Commission issued an Order authorizing the communications industry to implement what is called an all-services distributed overlay (or area code overlay) to resolve the 317 area code numbering shortage. Under the terms of the Order, the new area code overlay would become effective on Sept. 17, 2016, and the new area code will be 463, which spells "IND" on the telephone keypad.

Commission Order in Cause No. 44513

Next Steps

On Aug. 31, 2016, the Commission extended the deadline for mandatory 10-digit dialing from Sept. 17, 2016 to Oct. 15, 2016, out of consideration for the Electronic Security Association’s (ESA of Indiana’s) request for additional time to prepare for 10-digit dialing. In July 2016, ESA of Indiana notified the Commission that certain alarm companies may be behind in their preparations for the switch to mandatory 10-digit dialing. After meeting with representatives of the alarm companies to determine the scope of the problem and recognizing that the 317 area code is projected to run out of numbers in the fourth quarter of the year, the Commission reopened Cause No. 44513 and, after reviewing new evidence, moved the deadline out by one month.

Beginning Nov. 15, 2016, numbers assigned for new telephone lines or services in the 317 region may include the new 463 area code or a 317 area code. The new 463 area code will not change long-distance calling. In addition, local calling areas do not change when a new area code is established.

The biggest change for customers will be mandatory 10-digit dialing. When the area code overlay is effective, 10-digit dialing will be required for all local calls (3-digit area code + 7-digit phone number). Customers will continue to dial a "1" plus the 10-digit phone number for long-distance calls. Consumers also should make sure that alarm, safety, or medical devices that may have been programmed with 7-digit local telephone numbers are reprogrammed with a 10-digit telephone number (area code + local number) before Oct. 15, 2016.