Using our Gazetteer, we found that there are two North Carolina communities named Walnut Hills: This one is located in Wake County and the other is located in New Hanover County.
Beyond North Carolina, there are 17 communities that are also named Walnut Hills - they are located in Colorado, Indiana, Maryland, Ohio (5), South Carolina, Tennessee (3), Texas, Utah, Virginia and West Virginia.
If you're interested in how the shape of North Carolina's counties, including Wake, have changed over time, we recommend the Atlas of Historical County Boundaries.
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When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 919 code has been Overlayed with the 984 area code. New phone numbers in the Walnut Hills area will be assigned with one of these codes: 919 or 984. As a result, placing a call in the Walnut Hills area will require 10-digit dialing (where you enter both the area code and then the phone number).