Area Code 240
Area code 240 covers Washington and nearby cities including Frederick, Gaithersburg, Rockville in Maryland, in the Eastern Time.
Area code 240 quick facts
| Location | Washington, Maryland |
|---|---|
| Time zone | Eastern Time |
| In service | 1997-06-01 |
| Overlay codes | 227, 301 |
| Nearby codes | 227, 301, 202, 771, 571, 703 |
| Carrier coverage | 785 prefixes; 44% wireless |
| FTC complaint data | 402 complaints across 87 numbers |
| Data current as of | August 2, 2026 |
Is a call from 240 a scam? Who called me from 240?
FTC complaints involving 240 numbers
Numbers shown with area code 240 in the FTC's Do Not Call “Reported Calls” database (recent reporting window). Most common reported reasons: “Other”, “Dropped call or no message”, “Calls pretending to be government, businesses, or family and friends”.
Most-complained 240 numbers:
- (240) 232-8819 — 27 complaints
- (240) 824-4796 — 23 complaints
- (240) 934-0874 — 19 complaints
- (240) 353-1756 — 17 complaints
- (240) 574-1026 — 11 complaints
These are FTC Do Not Call complaints filed about specific numbers shown with this area code — frequently spoofed. The area code itself is not a scam. See the most-reported area codes and the most-reported phone numbers nationwide.
Cities in area code 240
Washington, Frederick, Gaithersburg, Rockville, Bowie, Hagerstown, Aspen Hill, Chillum, Clinton, College Park, Cumberland, Fairland
Area codes by city
Carriers in area code 240
Area code 240 spans 785 prefixes, about 44% wireless. Top carriers: OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC, ONVOY, LLC - MD, CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD, NEW CINGULAR WIRELESS PCS, LLC - DC. Look up the carrier and line type for a 240 number.
Other Maryland area codes
Nearby area codes
Frequently asked questions
Where is area code 240?
Area code 240 covers Washington and nearby cities including Frederick, Gaithersburg, Rockville in Maryland, in the Eastern Time.
What cities use area code 240?
Area code 240 serves Washington, Frederick, Gaithersburg, Rockville, Bowie, and 22 other communities in Maryland.
What time zone is area code 240 in?
Area code 240 is in the Eastern Time (America/New_York).
How do you dial a 240 number?
Dial all 10 digits: 240 followed by the 7-digit local number. From abroad, dial +1 240 and the local number.
Is a call from area code 240 a scam?
A 240 number is geographically tied to Maryland, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.
Is 240 a country code?
No. 240 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 240 number written for international dialing looks like +1 240 followed by the 7-digit local number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.