301 Area Code

The 301 area code is part of the North American Numbering Plan (NANP) and serves western and central Maryland, USA. Established in 1947 as one of the original area codes in the United States, 301 covers major cities, suburban areas, and rural regions, providing essential telecommunications services for residents, businesses, and government offices.

Understanding the 301 Area Code

The 301 area code covers Maryland regions including Rockville, Bethesda, Frederick, Hagerstown, Gaithersburg, and Silver Spring. It supports landline, mobile, and VoIP services. 10-digit dialing is required due to overlay area codes serving the same region.

301 Area Code Map and Geographic Location

The 301 area code map encompasses western and central Maryland, including the counties of Montgomery, Frederick, Washington, and parts of Prince George�s County. The area includes urban centers, suburban neighborhoods, and rural communities. Area code 301 operates alongside overlay code 240.

All Major Cities and Regions in the 301 Area Code

Rockville
Bethesda
Frederick
Hagerstown
Gaithersburg
Silver Spring
College Park
Clarksburg
Germantown

Counties Covered by the 301 Area Code

Montgomery County
Frederick County
Washington County
Parts of Prince George�s County

ZIP Codes within the 301 Telephone Zone (Examples)

20850 - Rockville
20814 - Bethesda
21701 - Frederick
21740 - Hagerstown
20877 - Gaithersburg
20910 - Silver Spring
20740 - College Park
20871 - Clarksburg
20874 - Germantown

Time Zone

The 301 area code is located in the Eastern Time Zone (ET), observing Eastern Standard Time (EST, UTC-5) in winter and Eastern Daylight Time (EDT, UTC-4) during daylight saving time.

Dialing, Phone & Service Details

Local dialing: 10-digit dialing is mandatory due to overlay with 240 area code.
Long-distance calls within the USA: Dial 1 + 301 + 7-digit number.
International calls: Dial your country�s exit code + 1 + 301 + 7-digit number.
Services: The 301 area code is used for landline phones, mobile devices, VoIP services, and business telecommunications.

Why the 301 Area Code Matters

The 301 area code is a key telecommunications hub in Maryland, connecting government offices, businesses, educational institutions, and residential communities. With its long history and recognition, many residents and organizations retain 301 numbers as part of their local identity.

What area code is 301? / Where's area code 301?

What area code is 301? � 301 is the telephone area code for western and central Maryland, covering cities such as Rockville, Bethesda, Frederick, and Hagerstown.

Where's area code 301? � It is located in Maryland, USA, primarily covering Montgomery, Frederick, Washington counties, and parts of Prince George�s County.

Frequently Asked Questions (FAQ) about 301 Area Code

What is the 301 area code?

301 serves western and central Maryland, including major cities like Rockville, Bethesda, Frederick, and Hagerstown.

When was the 301 area code created?

It was established in 1947 as one of the original area codes in the United States.

Where is area code 301 located?

It is located in western and central Maryland, USA.

What time zone is 301 in?

The 301 area code follows Eastern Time (EST/EDT).

Which counties are included in 301?

Montgomery, Frederick, Washington, and parts of Prince George�s County.

Feature	Details
Area Code	301 (Overlay: 240)
Region Covered	Western and central Maryland, USA
Established	1947 (original NANP code)
Time Zone	Eastern Time (EST/EDT)
Major Cities	Rockville, Bethesda, Frederick, Hagerstown, Gaithersburg
ZIP Range	20814-21740 (examples above)
Services	Landline, mobile, VoIP, business
Dialing	10-digit dialing; international format +1 301 NXX XXXX
Country	United States of America

Ares Code	Office / Place	Address
301 Area Code	University of Maryland, College Park	College Park, MD 20742
301 Area Code	Montgomery College � Rockville	51 Mannakee St, Rockville, MD 20850
301 Area Code	Montgomery College � Germantown	20200 Observation Dr, Germantown, MD 20876
301 Area Code	Montgomery College � Takoma Park/Silver Spring	7600 Takoma Ave, Takoma Park, MD 20912
301 Area Code	Hood College	401 Rosemont Ave, Frederick, MD 21701
301 Area Code	Frederick Community College	7932 Opossumtown Pike, Frederick, MD 21702
301 Area Code	St. Mary�s College of Maryland	47645 College Dr, St. Mary�s City, MD 20686
301 Area Code	University of Maryland Global Campus	1616 McCormick Dr, Largo, MD 20774
301 Area Code	Shady Grove Medical Center	9901 Medical Center Dr, Rockville, MD 20850
301 Area Code	Frederick Health Hospital	400 W 7th St, Frederick, MD 21701
301 Area Code	University of Maryland Charles Regional Medical Center	5 Garrett Ave, La Plata, MD 20646
301 Area Code	MedStar St. Mary�s Hospital	25500 Point Lookout Rd, Leonardtown, MD 20650
301 Area Code	Meritus Medical Center	11116 Medical Campus Rd, Hagerstown, MD 21742
301 Area Code	UPMC Western Maryland	12500 Willowbrook Rd, Cumberland, MD 21502
301 Area Code	PNC Bank	401 Hungerford Dr, Rockville, MD 20850
301 Area Code	M&T Bank	26 E Patrick St, Frederick, MD 21701
301 Area Code	Wells Fargo Bank	6325 Crain Hwy, La Plata, MD 20646
301 Area Code	Truist Bank	18 W Franklin St, Hagerstown, MD 21740
301 Area Code	Bank of America	7730 Wisconsin Ave, Bethesda, MD 20814
301 Area Code	Montgomery County Circuit Court	50 Maryland Ave, Rockville, MD 20850
301 Area Code	Frederick County Courthouse	100 W Patrick St, Frederick, MD 21701
301 Area Code	Charles County Courthouse	200 Charles St, La Plata, MD 20646
301 Area Code	Washington County Courthouse	24 Summit Ave, Hagerstown, MD 21740
301 Area Code	Allegany County Courthouse	30 Washington St, Cumberland, MD 21502
301 Area Code	College Park Aviation Museum	1985 Cpl Frank Scott Dr, College Park, MD 20740
301 Area Code	National Museum of Health and Medicine	2500 Linden Ln, Silver Spring, MD 20910
301 Area Code	National Museum of Civil War Medicine	48 E Patrick St, Frederick, MD 21701
301 Area Code	Antietam National Battlefield Visitor Center	5831 Dunker Church Rd, Sharpsburg, MD 21782
301 Area Code	Historic St. Mary�s City	18751 Hogaboom Ln, St. Mary�s City, MD 20686
301 Area Code	C&O Canal National Historical Park � Visitor Center	13 Canal St, Cumberland, MD 21502
301 Area Code	Strathmore Music Center	5301 Tuckerman Ln, North Bethesda, MD 20852
301 Area Code	AFI Silver Theatre	8633 Colesville Rd, Silver Spring, MD 20910
301 Area Code	Carroll Creek Park	50 Carroll Creek Way, Frederick, MD 21701
301 Area Code	Rio Lakefront	9841 Washingtonian Blvd, Gaithersburg, MD 20878
301 Area Code	MGM National Harbor	101 MGM National Ave, Oxon Hill, MD 20745
301 Area Code	NASA Goddard Space Flight Center	8800 Greenbelt Rd, Greenbelt, MD 20771
301 Area Code	Great Falls Park (MD Side)	11710 MacArthur Blvd, Potomac, MD 20854
301 Area Code	Rockville Memorial Library	21 Maryland Ave, Rockville, MD 20850
301 Area Code	Silver Spring Library	900 Wayne Ave, Silver Spring, MD 20910
301 Area Code	C. Burr Artz Public Library	110 E Patrick St, Frederick, MD 21701
301 Area Code	Washington County Free Library	100 S Potomac St, Hagerstown, MD 21740
301 Area Code	Charles County Public Library	2 Garrett Ave, La Plata, MD 20646
301 Area Code	College Park Airport	1909 Corporal Frank Scott Dr, College Park, MD 20740
301 Area Code	Frederick Municipal Airport	310 Aviation Way, Frederick, MD 21701
301 Area Code	Shady Grove Metro Station	15903 Somerville Dr, Rockville, MD 20855
301 Area Code	Greenbelt Metro Station	5717 Greenbelt Metro Dr, Greenbelt, MD 20740
301 Area Code	Rockville Metro Station	251 Hungerford Dr, Rockville, MD 20850
301 Area Code	Xfinity Center (UMD)	8500 Paint Branch Dr, College Park, MD 20742
301 Area Code	Maryland Stadium	90 Stadium Dr, College Park, MD 20742
301 Area Code	Harry Grove Stadium (Frederick Keys)	21 Stadium Dr, Frederick, MD 21703
301 Area Code	Regency Furniture Stadium (Blue Crabs)	11765 St Linus Dr, Waldorf, MD 20602
301 Area Code	Municipal Stadium (Hagerstown Suns � historic)	274 E Memorial Blvd, Hagerstown, MD 21740

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