Dialing local numbers will require entering the 570 area code starting Sept. 21.
The state Public Utility Commission announced Thursday that the "permissive dialing period" has begun, meaning people can still dial seven digits to place a call, but beginning Sept. 21, adding the area code will be necessary.
The change is in place to cope with a new area code, 272, that will apply to consumers who receive a new phone number starting Oct. 21, spokeswoman Denise McCracken said Thursday.
"Everyone who has a phone line keeps their number ... but after a certain date anyone who applies for a new number will get the new 272 area code," she said.
Callers will have to dial 1 plus the area code and telephone number for all long distance calls, although the price of a call, coverage area or other rates and services will not change.
Dialing 911 will also remain the same.
The move toward a new area code and 10-digit dialing will not be unique to the area.
"We've seen it happen all over the state over the past couple decades," McCracken said.
Kathryn McDermott, director of marketing and communications at the Greater Scranton Chamber of Commerce, said businesses will have to make sure they are printing 10 digits on their marketing materials.
"I think they have to be very careful, having the correct number on their websites, business cards, billboards, everything," she said.
Individuals with questions can contact their phone service provider or the PUC at 800-692-7380.
