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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).
As of June 1, 2013, there are 293 area codes in service in the 50 states, plus 1 for DC and 6 for various external territories of the United States (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), plus 10 more that are scheduled to be added in the coming months.