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Answer Wiki. There are between 700M-800M assigned geographic telephone numbers. Telecom service providers are the only entities that know how many active numbers they have. All service providers report this twice a year to the North American Numbering Plan Administrator (NANPA), a process called Numbering Resource Utilization Forecasting (NRUF).
Each three-digit area code may contain up to 7,919,900 unique phone numbers: 1  NXX may begin only with the digits [2â9], providing a base of 8 million numbers: ( 8 x 100 x 10000 2  ) . However, the last two digits of NXX cannot both be 1, to avoid confusion with the N11 codes (subtract 80,000).