- This city has 2 overlayed area codes.
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Area Code 240 serves the state of Maryland, covering regions that include Montgomery County and parts of Prince George's County. Established on March 1, 1997, it was created as an overlay to the 301 area code, addressing the growing demand for telephone numbers due to the area’s population increase and the proliferation of mobile devices. This overlay made it possible for new telephone numbers to be issued while maintaining the original 301 area code for existing lines.
The area code encompasses densely populated areas, including cities such as Rockville, Gaithersburg, and Silver Spring, reflecting the region's suburban character as well as its proximity to Washington, D.C. The development of telecommunications infrastructure in this area has played a critical role in supporting both residential and business communications.
240 primarily serves the needs of a diverse population, which contributes to a vibrant local economy driven by technology, healthcare, and education sectors. The area code also supports various telecommunications services, including mobile and VoIP systems, enhancing connectivity for its users.
As telecommunications technology continues to evolve, Area Code 240 remains central to keeping the region connected, adapting to changes in usage patterns and service demands. Its significance within the broader telecommunications landscape of Maryland underscores the area’s growth and the ongoing challenges of number allocation in an increasingly digital world.
Area code 240 covers parts of Maryland, including areas like Rockville and Gaithersburg. Here’s what to know before calling.
If you receive a phone call with the first 3 digits 240 in the United States, you should know that they could belong to Aspen Hill (MD), Bowie (MD), Chillum (MD), Clinton (MD), College Park (MD), Cumberland (MD), Fairland (MD), Fort Washington (MD), Frederick (MD), Gaithersburg (MD), Germantown (MD), Greenbelt (MD), Hagerstown (MD), Landover (MD), Montgomery Village (MD), North Bethesda (MD), North Potomac (MD), Olney (MD), Potomac (MD), Rockville (MD), Saint Charles (MD), Silver Spring (MD), South Laurel (MD), Suitland (MD), Waldorf (MD), White Oak (MD).
Dialing the area code 240 from another state in the United States is considered a long-distance call. Here’s how to make the call: First, dial the area code for 240. Each state, and sometimes specific cities within a state, has unique area codes. Then, enter the 7-digit phone number of the person or business you’re trying to reach. If you’re calling from a landline, check with your provider, as long-distance charges may apply. However, most mobile carriers in the U.S. offer nationwide calling without additional fees. Alternatively, you can use VoIP or internet-based calling apps, like Skype, Zoom, or WhatsApp, to bypass traditional long-distance charges. The number you want to reach should look like this: 1-(AreaCode)-111-2222.
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