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Area code 631 serves a portion of Long Island, New York, primarily covering Suffolk County. Established in 1997 through a split from area code 516, 631 was introduced to address the growing demand for telephone numbers in the region, reflecting the population growth and increased telecommunication needs of the area.

631 encompasses several significant communities, including Babylon, Islip, and Riverhead, as well as parts of the famous Hamptons, which are known for their seasonal influx of visitors. The area code's geographic and demographic diversity contributes to its unique telecommunications landscape, catering to both suburban residents and local businesses.

The area code has experienced developments in telecommunications technology, including the adoption of VoIP (Voice over Internet Protocol) services, which have transformed traditional communication methods. Regardless of these advancements, 631 remains essential to maintaining regional connectivity, supporting both landline and mobile communications.

Operators in this area face challenges related to number saturation, prompting the implementation of overlays, like area code 934, which began in 2019. This overlay helps to ensure the availability of new numbers without requiring residents to change their existing phone numbers. Overall, area code 631 not only facilitates essential communication services but also reflects the region's characteristics and evolving telecommunications landscape.