Area Code 857: Belmont, Massachusetts - area-code -

Frequently Asked Questions

Belmont, Massachusetts, primarily uses area code 857. This area code serves as an overlay to the original 617 area code, covering a significant portion of the Greater Boston area, including cities like Cambridge, Somerville, and Brookline, due to the high demand for phone numbers.
To dial an 857 number from a 617 number, or vice versa, dial the full 10-digit number, including the area code. This 10-digit dialing procedure is mandatory for all local calls within the 857 and 617 area codes.
Area code 857 was introduced in 2001 as an overlay for the existing 617 area code to accommodate the growing demand for phone numbers in the Boston metropolitan area. This approach avoided the disruption of a geographic split, allowing existing customers to keep their 617 numbers.
Area code 857 covers a significant portion of the Greater Boston area, including Belmont, Boston, Cambridge, Somerville, and Brookline. This broad coverage reflects the interconnected nature of the region's telecommunications network and the high demand for phone numbers in these densely populated areas.
To make a long-distance call to an 857 number, dial 1 + the 10-digit phone number (including the area code). This format applies to calls originating from any area code outside of 857 and 617.
Area code 857 is an overlay for area code 617, meaning they both serve the same geographic region. This setup allows for a larger pool of available phone numbers without requiring a geographic split, minimizing disruption for existing customers.
For operator-assisted calls to the 857 area code, dial 0 + the 10-digit phone number, including the area code. This method remains an option for specific circumstances despite the prevalence of direct dialing.
Yes, due to number portability rules, you can usually keep your existing phone number if you move within the 857 area code region. This simplifies the moving process and allows for consistent contact information.
In 2022, the median household income in Belmont, MA, reached $164,918. This signifies the economic vitality of the area and the corresponding high demand for telecommunication services, important information for businesses considering operating in Belmont.
As of 2022, Belmont, Massachusetts had a population of nearly 27,000. While recently experiencing a population decline, the town has seen a substantial increase in median household income, indicating continued demand for telecommunication services.
The technical specifications for area code 857 are standardized for both local and toll calls: 10 digits for local (HNPA and FNPA) and 1 + 10 digits for toll calls. Operator-assisted calls require 0 + 10 digits.
You can find further information on area codes and telecommunications regulations on the Federal Communications Commission (FCC) website.
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