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AREA CODE · MARYLAND

Area code 240

Area code 240 covers Washington, Maryland. Map, time zone, overlays, carriers, the full list of prefixes and how to dial it.

State: Maryland Major City: Washington Eastern Time (ET) Overlay: 227/240/301
01 / WHERE IT IS

Where is area code 240?

Area code 240 is assigned to Washington and the surrounding region in Maryland. Calls to numbers that start with 240 are routed to this area.

Area code 240 shares its territory with 227, 301. Because it is an overlay, local calls require dialing all 10 digits.

Counties covered

Montgomery CountyPrince George's CountyFrederick CountyCharles CountyWashington CountySt. Mary's CountyAllegany County

Line types

  • Mobile 36.31%
  • Landline 63.69%
02 / MAP

Area code 240 on the map

The shaded area joins the code’s numbering centers; the marker shows its main city.

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© OpenStreetMap contributors

03 / LOCAL TIME

Current time in Washington

This area code is in the Eastern Time (ET) time zone.

Local timeWashington, MD--:--:--

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America/New_YorkLive
04 / HOW TO DIAL

How to call Washington

WITHIN THE US240 XXX XXXX

Always 10 digits — landline, mobile or VoIP. Local, long distance or a different state: the format is always the same. You do not need to dial the 1 first.

FROM ABROAD+1 240 XXX XXXX

Exit codes: 00 Europe/Mexico · 011 Canada · 010 Japan · + universal

WHATSAPP / IMESSAGE+1 240 XXX XXXX

Always save the number in international format so messaging apps recognize it correctly:

Call typeTraditional landlineMobile / VoIP
Local (same area code)10 digits10 digits
US long distance1 + 10 digits10 digits
Emergency911911
🌐Universal+1 240 555 0123
🇪🇸🇲🇽Spain / Mexico00 1 240 555 0123
🇦🇺Australia0011 1 240 555 0123
🇯🇵Japan010 1 240 555 0123
HAVE THE FULL NUMBER?

Learn more about that number.

Check the line type and the carrier the number block was originally assigned to.

10 digits to see the carrier and line type of the number

05 / CARRIERS

Carriers in area code 240

Share of the number blocks by carrier and line type.

Landline

Lumen Technologies
13%
Windstream Communications
13%
Sinch
11%
Verizon Business
10%
Verizon
10%
Others
44%

Mobile

T-Mobile USA
41%
Verizon Wireless
30%
AT&T Mobility
24%
Sinch
2%
USCOC OF CUMBERLAND / UNITED STATES CEL MD
1%
Others
2%

Carrier shown is the original assignment of each number block and may differ today because of number portability.

06 / PREFIXES

Complete list of prefixes for area code 240

785 number blocks (NXX) assigned in this area code.

PrefixTypeCityCarrier
(240) 200 Landline Washington Zone 2 BandwidthBANDWIDTH.COM CLEC, LLC - MD
(240) 201 Landline Ridge InfobipPEERLESS NETWORK OF MARYLAND, LLC
(240) 202 Landline Highfield SinchONVOY, LLC - MD
(240) 203 Mobile Hagerstown T-Mobile USAOMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
(240) 204 Mobile Washington Zone 2 Verizon WirelessCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
(240) 205 Mobile Washington Zone 10 AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC - DC
(240) 206 Landline Washington Zone 14 Verizon BusinessMCIMETRO ACCESS TRANSMISSION SERVICES LLC
(240) 207 Landline Damascus Windstream CommunicationsPAETEC ITEL, LLC
(240) 208 Landline La Plata InfobipPEERLESS NETWORK OF MARYLAND, LLC
(240) 209 Landline Indian Head InfobipPEERLESS NETWORK OF MARYLAND, LLC

Showing 10 of 785 prefixes

07 / FAQ

Frequently asked questions about area code 240

Where is area code 240 used?
Area code 240 serves Washington and the surrounding area in Maryland, including Montgomery County, Prince George's County, Frederick County, Charles County, Washington County.
What city is area code 240 from?
The main city of area code 240 is Washington, MD.
What time zone is area code 240 in?
Area code 240 is in the Eastern Time (ET) time zone (America/New_York).
Is 240 an overlay area code?
Yes. It shares its territory with 227, 301. In an overlay, every call requires dialing all 10 digits.
How do I call a number with area code 240 from the United States?
Dial the 10 digits: 240 + 7-digit number. For some long-distance calls from a landline you may need to add a 1 first.
How do I call a 240 number from another country?
Dial your country's exit code (or +), then 1, then 240 and the seven-digit number. From a mobile you can use +1 240 XXX XXXX.
Which carriers use area code 240?
Most landline blocks belong to Lumen Technologies and most mobile blocks to T-Mobile USA. The carrier shown is the original assignment and may differ today because of number portability.
Is area code 240 for landlines, mobiles or both?
Both. About 63.69% of the number blocks are landline, 36.31% mobile.
How do I save a 240 number in WhatsApp or my phone?
Save it in international format: +1 240 XXX XXXX. That way WhatsApp, iMessage and Telegram recognize it from any country.
Is it safe to answer calls from area code 240?
The area code only shows the region a number was assigned to; it does not tell you who is calling. Scammers can fake any area code, so do not share personal or banking information with unknown callers, and let unknown numbers go to voicemail.
KEEP EXPLORING

Nearby area codes

703Washington, VA202Washington, DC771Washington, DC571Washington, VA717Lancaster, PA302Wilmington, DE

Other area codes in Maryland

227 · Washington301 · Washington410 · Baltimore443 · Baltimore667 · Baltimore

View all Maryland area codes →