What is the area code for Gaithersburg, MD?

Gaithersburg uses 3 area codes: 301, 240 and 227. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.

What time zone is Gaithersburg in?

Gaithersburg is in the Eastern time zone.

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Gaithersburg, MD Area Codes

Gaithersburg, Maryland (population 71,113) uses area codes 301, 240 and 227.

Area code301

Area code240

Area code227

Time zoneEastern

Local time now…

Gaithersburg and nearby cities in area code 301

Carriers with Gaithersburg numbers

80 prefixes are assigned to the Gaithersburg exchange: 14% mobile, 30% VoIP and cable, 56% landline.

Carrier	Prefixes
Verizon	25
Verizon Business (MCImetro)	7
Metropcs	7
Onvoy (Sinch)	7
Paetec Itel	7
Verizon Wireless	5
AT&T Mobility	5
Lumen (Level 3)	4

Area codes used in Gaithersburg

Area code	Prefixes serving Gaithersburg	Main carriers in this code
301	544	Verizon, Verizon Wireless, AT&T Mobility
240	390	T-Mobile, Verizon Wireless, AT&T Mobility
227	76	Onvoy (Sinch), AT&T Mobility, T-Mobile

Gaithersburg phone number prefixes

Numbers starting with these first six digits were originally assigned to the Gaithersburg exchange.

301-208 Verizon
301-216 Verizon
301-250 Verizon Business (MCImetro)
301-252 Metropcs
301-301 Onvoy (Sinch)
301-330 Verizon
301-337 Verizon Business (MCImetro)
301-355 Verizon
301-366 Metropcs
301-370 Metropcs
301-407 Verizon
301-515 Verizon
301-519 Verizon
301-525 Quantum Telecommunications
301-527 Verizon
301-528 Verizon
301-540 Verizon
301-556 AT&T (Teleport)
301-569 Verizon Wireless
301-591 Paetec Itel
301-740 Verizon
301-820 AT&T (Teleport)
301-869 Verizon
301-916 Verizon
301-926 Verizon
301-944 Verizon Business (MCImetro)
301-947 Verizon
301-956 Verizon
301-963 Verizon
301-972 Verizon
301-977 Verizon
301-987 Verizon
301-990 Verizon
240-224 Verizon Wireless
240-243 Verizon Business (MCImetro)
240-246 Starpower Communications
240-252 Lumen (Level 3)
240-261 Onvoy (Sinch)
240-306 Verizon Business (MCImetro)
240-327 Core Communications
240-361 Paetec Itel
240-364 Paetec Itel
240-372 Metropcs
240-388 Metropcs
240-404 Verizon Business (MCImetro)
240-449 AT&T Mobility
240-454 Paetec Itel
240-474 Baltimore-Washington Telephone (Bwt)
240-477 Paetec Itel
240-562 Verizon Business (MCImetro)
240-597 Peerless Network
240-631 Verizon
240-632 Verizon
240-654 AT&T Mobility
240-658 Vonage
240-683 Verizon
240-686 Verizon
240-690 AT&T (Teleport)
240-702 Verizon Wireless
240-720 Lumen (Level 3)
240-750 AT&T Mobility
240-751 Lumen (Level 3)
240-780 Lumen (Level 3)
240-793 Metropcs
240-798 Onvoy (Sinch)
240-801 Verizon Wireless
240-805 Verizon Wireless
240-813 Paetec Itel
240-848 Metropcs
240-912 Paetec Itel
240-937 Bandwidth
240-981 Nuso
240-982 Onvoy (Sinch)
227-227 Onvoy (Sinch)
227-245 Onvoy (Sinch)
227-258 AT&T Mobility
227-277 T-Mobile
227-324 AT&T Mobility
227-500 Opentact
227-529 Onvoy (Sinch)

Nearby cities in area code 301

Questions

What is the area code for Gaithersburg, MD?: Gaithersburg uses 3 area codes: 301, 240 and 227. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
What time zone is Gaithersburg in?: Gaithersburg is in the Eastern time zone.