The North American Numbering Plan (NANP) Administration has just completed its review of assigned area codes and area codes still available for assignment. Results show that we’ll be able to keep giving out phone numbers in the current format for at least 30 more years.
Utilizing historical central office code assignments and service provider submitted data, the report reviews all geographic area codes in the US, and provides "an NPA-by-NPA exhaust projection". Using an assumption of an "average CO code demand rate of 5,800 codes assigned per year and 685 available NPA codes", the present analysis indicates NANP exhaust beyond 2039. More details are available at www.nanpa.com.