Area Code 240: Detailed Coverage, Cities, and Carrier Information for Maryland
Area code 240 is an overlay serving western Maryland, including cities like Frederick and Rockville. Implemented June 1, 1997, it overlays area code 301. Discover major cities covered, technical specifications (NPA 240), and regulatory details from NANPA. Ten-digit dialing is mandatory.
Frequently Asked Questions
What area code is used in Aspen Hill, Maryland?
When was area code 240 implemented in Maryland?
Why was area code 240 introduced in Maryland?
Is 10-digit dialing required for calls within area code 240?
What is the regulatory body that oversees area code 240?
Which area code did 240 overlay in Maryland?
What major cities are included in area code 240?
What is the area code for Cumberland, Maryland?
Does area code 240 cover parts of the Washington, D.C. metro area?
What types of phone services are available in area code 240?
What was the original area code for western Maryland before 240?
When was area code 301 split to create area code 410?
When was area code 227 introduced as an overlay in Maryland?
What cities are in area code 240 Maryland?
When was area code 240 Maryland established?
Why was area code 240 Maryland created?
How to dial a number in area code 240?
What is the area code 240 overlay for?
What is the regulatory body for area code 240?
What area code is Hagerstown Maryland?
Can I use VoIP with area code 240?
What is the history of area code 301?
When should I use 10-digit dialing for area code 240?
