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# The 771 Area Code and North American Numbering Plan

The 771 area code is an overlay area code serving the District of Columbia, sharing the same geographic region as the original 202 area code. Implemented to accommodate the growing demand for telephone numbers in the nation's capital, 771 operates alongside 202 within Washington, D.C., allowing both codes to serve the same territory. Callers within the district must dial all ten digits (area code plus seven-digit number) to complete local calls, a requirement known as mandatory ten-digit dialing. This overlay system enables the telecommunications infrastructure to support an expanding population and increasing business activity without requiring geographic boundaries to be redrawn.

The North American Numbering Plan (NANP) is the standardized system that designates area codes like 771 across the United States, Canada, and other North American territories. Administered by the North American Numbering Plan Administration (NANPA), this system organizes telephone numbers into a three-digit area code followed by a seven-digit local number. When existing area codes become depleted due to population growth or technological demands, the NANP introduces overlay codes like 771 to maximize the available number supply. This systematic approach ensures efficient allocation of telephone resources while maintaining compatibility across the continent's telecommunications network.