Lookup › Area code 240
240 Area Code — Rockville, Maryland
Area code 240 serves Rockville, MD.
Most looked-up 240 numbers
- 240-435-5694
- 240-441-7888
- 240-216-6521
- 240-435-4665
- 240-305-4773
- 240-232-4284
- 240-422-3855
- 240-609-6235
- 240-202-1273
- 240-393-0959
- 240-706-2186
- 240-558-6361
Phone prefixes in 240
Carriers serving 240
- Verizon (3 numbers)
- T-Mobile (3 numbers)
- At&t (2 numbers)
- Twilio (2 numbers)
- Onvoy, LLC - Md (1 numbers)
- Onvoy, LLC Va (1 numbers)
Frequently asked questions
Where is area code 240?
Area code 240 serves Rockville, MD.
What prefixes are in area code 240?
Phone2.io tracks 12 phone prefixes in area code 240, with carrier and spam-report data on individual numbers.
More about area code 240
Area code 240 overview, history, and local numbers · Get a MD phone number
Last updated: May 1, 2026