Area code 240 covers part of Marylandstate, covering most of Montgomery, Prince George's, Frederick, Washington, Charles counties. It was started on Jan 01, 2000. This region follows US/Eastern + Daylight Savings timezone. Other popular area codes that belong to Maryland state include 301, 410, 443, 667.
Date Changed | Change Details |
May 11, 2014 | Area code 301 subscribers are now overlayed with area code 240. Subscriber area code 240-308 was assigned on Apr 11, 2014 and is operational from May 11, 2014. |
Apr 20, 2014 | Area code 301 subscribers are now overlayed with area code 240. Subscriber area code 240-307 was assigned on Mar 25, 2014 and is operational from Apr 20, 2014. |
Apr 12, 2014 | Area code 301 subscribers are now overlayed with area code 240. Subscriber area code 240-341 was assigned on Mar 14, 2014 and is operational from Apr 12, 2014. |
Mar 31, 2014 | Area code 301 subscribers are now overlayed with area code 240. Subscriber area code 240-360 was assigned on Mar 03, 2014 and is operational from Mar 31, 2014. |
Mar 20, 2014 | Area code 301 subscribers are now overlayed with area code 240. Subscriber area code 240-391 was assigned on Sep 14, 2007 and is operational from Mar 20, 2014. |
Mar 20, 2014 | Area code 301 subscribers are now overlayed with area code 240. Subscriber area code 240-342 was assigned on Sep 24, 2007 and is operational from Mar 20, 2014. |
Area Code | City | County | Population | Network Operator |
240-300-3 | Station Hills | Charles | 146,551 | Leap Wireless International Inc dba Cricket Communications Inc |
240-300-0 | Washington | Charles | 146,551 | Cellco Partnership dba Verizon Wireless - MD |
240-300-9 | Washington | Charles | 146,551 | Sprint Spectrum LP |
240-303-0 | Herndon | Prince George's | 863,420 | Cavalier Telephone Mid-Atlantic LLC - MD |
240-303-2 | Washington | Prince George's | 863,420 | Bandwidth.com CLEC LLC - MD |
240-303-3 | Washington | Prince George's | 863,420 | Broadvox - CLEC LLC - DC |
240-304-0 | Beltsville | Prince George's | 863,420 | Sprint Spectrum LP |
240-304-9 | Beltsville | Prince George's | 863,420 | Sprint Spectrum LP - MD |
240-304-3 | Washington | Prince George's | 863,420 | Peerless Network of Maryland LLC |
240-305 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-306 | Washington | Montgomery | 971,777 | Allegiance Telecom of Maryland Inc |
240-307-3 | Frederick | Frederick | 233,385 | MCImetro Access Transmission Services LLC |
240-307-6 | Frederick | Frederick | 233,385 | Teleport Communications America LLC - MD |
240-307-1 | Hagerstown | Frederick | 233,385 | Bandwidth.com CLEC LLC - MD |
240-307-0 | Monrovia | Frederick | 233,385 | AT&T Local |
240-308-0 | Beltsville | Montgomery | 971,777 | New Cingular Wireless PCS LLC - DC |
240-308-6 | Mc Lean | Montgomery | 971,777 | Level 3 Communications LLC - MD |
240-308-8 | Washington | Montgomery | 971,777 | Bandwidth.com CLEC LLC - MD |
240-308-7 | Washington | Montgomery | 971,777 | MCImetro Access Transmission Services LLC |
240-309-4 | Leonardtown | St. Mary's | 105,151 | IDT America Corporation - MD |
240-309-6 | Mc Lean | St. Mary's | 105,151 | Level 3 Communications LLC - MD |
240-309-2 | Washington | St. Mary's | 105,151 | Bandwidth.com CLEC LLC - MD |
240-309-0 | Washington | St. Mary's | 105,151 | Cellco Partnership dba Verizon Wireless - MD |
240-310-6 | Frederick | Washington | 147,430 | Omnipoint Communications Cap Operations LLC |
240-310-1 | Frederick | Washington | 147,430 | US LEC of Maryland Inc |
240-310-0 | Frederick | Washington | 147,430 | USCOC of Cumberland Inc dba United States Cellular - MD |
240-310-9 | Hagerstown | Washington | 147,430 | Bandwidth.com CLEC LLC - MD |
240-310-8 | Hagerstown | Washington | 147,430 | Sprint Spectrum LP - MD |
240-310-4 | Monrovia | Washington | 147,430 | New Cingular Wireless PCS LLC - DC |
240-311 | 333,313 | Non Emergency Police And Other Governmental Services | ||
240-312-0 | Herndon | Prince George's | 863,420 | Cavalier Telephone Mid-Atlantic LLC - MD |
240-312-3 | Mc Lean | Prince George's | 863,420 | Level 3 Communications LLC - MD |
240-313-8 | Frederick | Washington | 147,430 | Cellco Partnership dba Verizon Wireless - MD |
240-313-6 | Hagerstown | Washington | 147,430 | Sprint Spectrum LP |
240-313-0 | Hagerstown | Washington | 147,430 | Verizon Maryland Inc |
240-313-7 | Monrovia | Washington | 147,430 | AT&T Local |
240-313-5 | Monrovia | Washington | 147,430 | New Cingular Wireless PCS LLC - DC |
240-314-9 | Beltsville | Montgomery | 971,777 | Omnipoint Communications Cap Operations LLC |
240-314-0 | Rockville | Montgomery | 971,777 | Verizon Maryland Inc |
240-315-8 | Frederick | Frederick | 233,385 | Cellco Partnership dba Verizon Wireless - MD |
240-315-2 | Frederick | Frederick | 233,385 | Sprint Spectrum LP |
240-315-0 | Frederick | Frederick | 233,385 | Verizon Maryland Inc |
240-316-0 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-316-4 | Washington | Montgomery | 971,777 | Bandwidth.com CLEC LLC - MD |
240-316-3 | Washington | Montgomery | 971,777 | XO Maryland LLC |
240-317-0 | Lanham | St. Mary's | 105,151 | Starpower Communications LLC - MD |
240-317-5 | Leonardtown | St. Mary's | 105,151 | IDT America Corporation - MD |
240-317-3 | Mc Lean | St. Mary's | 105,151 | Level 3 Communications LLC - MD |
240-317-9 | Washington | St. Mary's | 105,151 | Bandwidth.com CLEC LLC - MD |
240-317-1 | Washington | St. Mary's | 105,151 | Sprint Spectrum LP |
240-317-6 | Washington | St. Mary's | 105,151 | XO Maryland LLC |
240-318-5 | Alexandria | Prince George's | 863,420 | Comcast Phone of Northern Maryland Inc - MD |
240-318-4 | Beltsville | Prince George's | 863,420 | MetroPCS Inc |
240-318-0 | Clinton | Prince George's | 863,420 | Verizon Maryland Inc |
240-318-8 | Laurel | Prince George's | 863,420 | VDL Inc dba Global Telecom Brokers - MD |
240-318-9 | Washington | Prince George's | 863,420 | Peerless Network of Maryland LLC |
240-319-7 | Baltimore | Howard | 287,085 | Allegiance Telecom of Maryland Inc |
240-319-8 | Baltimore | Howard | 287,085 | Bandwidth.com CLEC LLC - MD |
240-319-0 | Baltimore | Howard | 287,085 | Cellco Partnership dba Verizon Wireless - MD |
240-320-0 | Washington | Charles | 146,551 | Cavalier East LLC - MD |
240-320-7 | Washington | Charles | 146,551 | Cellco Partnership dba Verizon Wireless - MD |
240-321-0 | Cumberland | Garrett | 30,097 | USCOC of Cumberland Inc dba United States Cellular - MD |
240-321-9 | Hagerstown | Garrett | 30,097 | Bandwidth.com CLEC LLC - MD |
240-321-8 | Monrovia | Garrett | 30,097 | New Cingular Wireless PCS LLC - DC |
240-322 | Frederick | Allegany | 75,087 | Core Communications Inc - MD |
240-323 | Frederick | Frederick | 233,385 | Core Communications Inc - MD |
240-324-9 | Baltimore | Howard | 287,085 | Bandwidth.com CLEC LLC - MD |
240-324-0 | Baltimore | Howard | 287,085 | YMax Communications Corporation - MD |
240-325 | Chevy Chase | Montgomery | 971,777 | Core Communications Inc - MD |
240-326-0 | Herndon | Prince George's | 863,420 | Cavalier Telephone Mid-Atlantic LLC - MD |
240-326-3 | Washington | Prince George's | 863,420 | Bandwidth.com CLEC LLC - MD |
240-327 | Chevy Chase | Montgomery | 971,777 | Core Communications Inc - MD |
240-328-6 | Alexandria | Montgomery | 971,777 | Comcast Phone of Northern Maryland Inc - MD |
240-328-9 | Annapolis Junction | Montgomery | 971,777 | Cellco Partnership dba Verizon Wireless - MD |
240-328-8 | Beltsville | Montgomery | 971,777 | New Cingular Wireless PCS LLC - DC |
240-328-0 | Rockville | Montgomery | 971,777 | Verizon Maryland Inc |
240-329-0 | Frederick | Washington | 147,430 | Level 3 Communications LLC - MD |
240-329-8 | Hagerstown | Washington | 147,430 | Sprint Spectrum LP - MD |
240-329-5 | Martinsburg | Washington | 147,430 | Fibernet LLC - WV |
240-329-1 | Monrovia | Washington | 147,430 | New Cingular Wireless PCS LLC - DC |
240-330-5 | Beltsville | Montgomery | 971,777 | Omnipoint Communications Cap Operations LLC |
240-330-0 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-330-1 | Mc Lean | Montgomery | 971,777 | US LEC of Maryland Inc |
240-330-4 | Washington | Montgomery | 971,777 | Cbeyond Communications LLC - MD |
240-330-6 | Washington | Montgomery | 971,777 | YMax Communications Corporation - MD |
240-331 | Washington | Montgomery | 971,777 | Peerless Network of Maryland LLC |
240-332 | Washington | Charles | 146,551 | Peerless Network of Maryland LLC |
240-333 | Washington | Montgomery | 971,777 | Cavalier East LLC - MD |
240-334-2 | Alexandria | Prince George's | 863,420 | Comcast Phone of Northern Maryland Inc - MD |
240-334-1 | Beltsville | Prince George's | 863,420 | MetroPCS Inc |
240-334-8 | Beltsville | Prince George's | 863,420 | Omnipoint Communications Cap Operations LLC |
240-334-6 | Mc Lean | Prince George's | 863,420 | Level 3 Communications LLC - MD |
240-334-0 | Washington | Prince George's | 863,420 | Global Crossing Local Services Inc - MD |
240-335-0 | Herndon | Prince George's | 863,420 | Cavalier Telephone Mid-Atlantic LLC - MD |
240-336 | Chevy Chase | Montgomery | 971,777 | Core Communications Inc - MD |
240-337 | Washington | Prince George's | 863,420 | Peerless Network of Maryland LLC |
240-338-0 | Annapolis Junction | Montgomery | 971,777 | Cellco Partnership dba Verizon Wireless - MD |
240-338-8 | Beltsville | Montgomery | 971,777 | New Cingular Wireless PCS LLC - DC |
240-339-1 | Alexandria | Prince George's | 863,420 | Comcast Phone of Northern Maryland Inc - MD |
240-339-5 | Washington | Prince George's | 863,420 | Bandwidth.com CLEC LLC - MD |
240-339-6 | Washington | Prince George's | 863,420 | Broadvox - CLEC LLC - DC |
240-340-0 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-341-2 | Frederick | Frederick | 233,385 | Comcast Phone of Northern Maryland Inc - MD |
240-341-1 | Hagerstown | Frederick | 233,385 | Bandwidth.com CLEC LLC - MD |
240-342-2 | Alexandria | Montgomery | 971,777 | Comcast Phone of Northern Maryland Inc - MD |
240-342-3 | Mc Lean | Montgomery | 971,777 | Level 3 Communications LLC - MD |
240-343-0 | Frederick | Washington | 147,430 | Cellco Partnership dba Verizon Wireless - MD |
240-344-0 | Monrovia | Frederick | 233,385 | New Cingular Wireless PCS LLC - DC |
240-345-0 | Baltimore | Howard | 287,085 | Level 3 Communications LLC - MD |
240-345-8 | Baltimore | Howard | 287,085 | YMax Communications Corporation - MD |
240-346-0 | Washington | Charles | 146,551 | Sprint Spectrum LP |
240-347-9 | Frederick | Washington | 147,430 | YMax Communications Corporation - MD |
240-347-4 | Martinsburg | Washington | 147,430 | Sprint Communications Company LP - MD |
240-348-7 | Alexandria | Prince George's | 863,420 | Comcast Phone of Northern Maryland Inc - MD |
240-349-2 | Alexandria | Charles | 146,551 | Comcast Phone of Northern Maryland Inc - MD |
240-349-7 | Washington | Charles | 146,551 | Broadvox - CLEC LLC - DC |
240-350 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-351 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-352 | Washington | Charles | 146,551 | Peerless Network of Maryland LLC |
240-353 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-354 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-355 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-356-0 | Frederick | Frederick | 233,385 | Level 3 Communications LLC - MD |
240-356-7 | Hagerstown | Frederick | 233,385 | Sprint Spectrum LP - MD |
240-357-0 | Frederick | Frederick | 233,385 | Cellco Partnership dba Verizon Wireless - MD |
240-358 | Washington | Montgomery | 971,777 | Peerless Network of Maryland LLC |
240-359 | Washington | Charles | 146,551 | Peerless Network of Maryland LLC |
240-360-0 | Beltsville | Prince George's | 863,420 | Omnipoint Communications Cap Operations LLC |
240-361-8 | Beltsville | Montgomery | 971,777 | New Cingular Wireless PCS LLC - DC |
240-362-0 | Cresaptown | Allegany | 75,087 | Verizon Maryland Inc |
240-362-9 | Hagerstown | Allegany | 75,087 | Bandwidth.com CLEC LLC - MD |
240-363 | Reston | Montgomery | 971,777 | Global Naps South Inc - MD |
240-364-4 | Beltsville | Montgomery | 971,777 | New Cingular Wireless PCS LLC - DC |
240-365 | Chevy Chase | Montgomery | 971,777 | Baltimore-Washington Telephone (BWT) |
240-366-3 | Frederick | Washington | 147,430 | US LEC of Maryland Inc |
240-366-8 | Martinsburg | Washington | 147,430 | Sprint Communications Company LP - MD |
240-367-3 | Frederick | Frederick | 233,385 | Omnipoint Communications Cap Operations LLC |
240-367-9 | Hagerstown | Frederick | 233,385 | Bandwidth.com CLEC LLC - MD |
240-368 | Washington | Charles | 146,551 | Peerless Network of Maryland LLC |
240-369 | Mount Airy | Carroll | 167,134 | Core Communications Inc - MD |
240-370-0 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-371 | Washington | Montgomery | 971,777 | Peerless Network of Maryland LLC |
240-372 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-373 | Odenton | Prince George's | 863,420 | Verizon Maryland Inc |
240-374-9 | Annapolis Junction | Prince George's | 863,420 | Cellco Partnership dba Verizon Wireless - MD |
240-374-0 | Washington | Prince George's | 863,420 | Global Crossing Local Services Inc - MD |
240-375 | Beltsville | Prince George's | 863,420 | Sprint Spectrum LP |
240-376 | Washington | Charles | 146,551 | Peerless Network of Maryland LLC |
240-377-8 | Alexandria | Charles | 146,551 | Comcast Phone of Northern Maryland Inc - MD |
240-377-0 | Washington | Charles | 146,551 | Global Crossing Local Services Inc - MD |
240-378 | Frederick | Allegany | 75,087 | Core Communications Inc - MD |
240-379 | Frederick | Frederick | 233,385 | Verizon Maryland Inc |
240-380-0 | Annapolis Junction | Montgomery | 971,777 | Cellco Partnership dba Verizon Wireless - MD |
240-380-1 | Mc Lean | Montgomery | 971,777 | US LEC of Maryland Inc |
240-381 | Beltsville | Montgomery | 971,777 | New Cingular Wireless PCS LLC - DC |
240-382-1 | Frederick | Washington | 147,430 | Comcast Phone of Northern Maryland Inc - MD |
240-382-9 | Hagerstown | Washington | 147,430 | Sprint Spectrum LP - MD |
240-383-5 | Annapolis Junction | Montgomery | 971,777 | Cellco Partnership dba Verizon Wireless - MD |
240-383-3 | Washington | Montgomery | 971,777 | XO Maryland LLC |
240-384 | Washington | St. Mary's | 105,151 | Peerless Network of Maryland LLC |
240-385-7 | Frederick | Frederick | 233,385 | Cellco Partnership dba Verizon Wireless - MD |
240-385-9 | Hagerstown | Frederick | 233,385 | Bandwidth.com CLEC LLC - MD |
240-386-8 | Alexandria | Montgomery | 971,777 | Comcast Phone of Northern Maryland Inc - MD |
240-386-0 | Gaithersburg | Montgomery | 971,777 | Verizon Maryland Inc |
240-387-0 | Washington | Prince George's | 863,420 | Cavalier East LLC - MD |
240-388-5 | Beltsville | Montgomery | 971,777 | New Cingular Wireless PCS LLC - DC |
240-388-8 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP - MD |
240-389-1 | Alexandria | Montgomery | 971,777 | Comcast Phone of Northern Maryland Inc - MD |
240-389-0 | Washington | Montgomery | 971,777 | ATX Telecommunications Services Ltd |
240-390-0 | Herndon | Montgomery | 971,777 | Cavalier Telephone Mid-Atlantic LLC - MD |
240-390-3 | Washington | Montgomery | 971,777 | XO Maryland LLC |
240-391-6 | Alexandria | Prince George's | 863,420 | Comcast Phone of Northern Maryland Inc - MD |
240-391-0 | Washington | Prince George's | 863,420 | Global Crossing Local Services Inc - MD |
240-392-2 | Alexandria | Prince George's | 863,420 | Comcast Phone of Northern Maryland Inc - MD |
240-392-0 | Lanham | Prince George's | 863,420 | Starpower Communications LLC - MD |
240-392-6 | Washington | Prince George's | 863,420 | Broadvox - CLEC LLC - DC |
240-393-0 | Annapolis Junction | Montgomery | 971,777 | Cellco Partnership dba Verizon Wireless - MD |
240-394-4 | Frederick | Carroll | 167,134 | Level 3 Communications LLC - MD |
240-394-0 | Monrovia | Carroll | 167,134 | New Cingular Wireless PCS LLC - DC |
240-395-3 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-396-6 | Alexandria | Montgomery | 971,777 | Comcast Phone of Northern Maryland Inc - MD |
240-396-8 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-397-0 | Frederick | Frederick | 233,385 | Cellco Partnership dba Verizon Wireless - MD |
240-397-2 | Frederick | Frederick | 233,385 | US LEC of Maryland Inc |
240-398-0 | Beltsville | Montgomery | 971,777 | Sprint Spectrum LP |
240-398-5 | Mc Lean | Montgomery | 971,777 | US LEC of Maryland Inc |
240-399 | Washington | Montgomery | 971,777 | XO Maryland LLC |
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