What does 510 mean in US Phone Area Codes?

510

Year 510 (DX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Severinus without colleague (or, less frequently, year 1263 Ab urbe condita). The denomination 510 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

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