Area Code 301 Information



Area Code 301
Population 291576
Type of Code: General Purpose Code
Geographic(G) or non-geographic(N): G
Is this code assigned: Yes
Is this code in use: Y
In service date: 1947-01-01
Planning Letter(s): IL96/06-009
Location: MD
Country: US
Time Zone: E
Parent NPA:

Area code 301, established in 1947 as part of the North American Numbering Plan (NANP), originally covered all of Maryland. But with population growth and increased demand for telephone services, area code 301 was split in 1991 to create area code 410 for the Eastern Shore and central Maryland. To meet the growing need for more phone numbers, area code 240 was introduced as an overlay to 301 in 1997. In 2012, another overlay, area code 227, was added.

Currently, area code 301 serves western, southern, and part of central Maryland. This includes Montgomery County, Prince George's County, Charles County, Frederick County, Washington County, Allegany County, Garrett County, and part of Howard County. Major cities and towns within this area code include Bethesda, Cumberland, Frederick, Gaithersburg, Hagerstown, Potomac, Rockville, and Silver Spring, spanning approximately 9,226 square miles.

Area code 301 includes several zip codes, each representing unique communities and neighborhoods. Notable zip codes include:

- Rockville: 20847 - 20853
- Gaithersburg: 20877 - 20885, 20898, 20899
- Frederick: 21701 - 21705, 21709
- Bethesda: 20810 - 20817, 20824, 20827, 20889, 20892, 20894
- Hagerstown: 21740 - 21749
- Silver Spring: 20901 - 20908, 20910, 20911, 20914, 20915

As of the 2020 U.S. Census, the estimated population of counties within the 301 area code is around 2.1 million. Rockville is among the most populous cities in this region, with approximately 69,000 residents. Gaithersburg follows closely with about 68,000 residents. Bethesda, a significant business hub, has around 64,000 people. Silver Spring, although its boundaries are undefined, is believed to house over 71,000 inhabitants.

The economy within area code 301 is diverse, with cities like Bethesda, Frederick, Gaithersburg, and Rockville thriving in sectors such as biotechnology, healthcare, and technology. Bethesda, located near Washington, D.C., attracts numerous government agencies, non-profit organizations, and multinational corporations.

In conclusion, area code 301 represents more than just a telephonic identifier—it is an integral part of Maryland's history, population, economy, and culture. As Maryland's first area code, it continues to play a crucial role in connecting individuals, households, and businesses within Maryland and beyond.

Area Code Zipcodes



Zipcode City State
20588 CAMP SPRINGS Maryland
20588 CHELTENHAM Maryland
20588 COLUMBIA Maryland
20588 DEPT HS Maryland
20588 DHS Maryland
20601 WALDORF Maryland
20602 SAINT CHARLES Maryland
20602 WALDORF Maryland
20603 SAINT CHARLES Maryland
20603 WALDORF Maryland
20604 SAINT CHARLES Maryland
20604 WALDORF Maryland
20606 ABELL Maryland
20607 ACCOKEEK Maryland
20608 AQUASCO Maryland
20608 EAGLE HARBOR Maryland
20609 AVENUE Maryland
20611 BEL ALTON Maryland
20613 BRANDYWINE Maryland
20616 BRYANS RD Maryland
20616 BRYANS ROAD Maryland
20616 MARSHALL HALL Maryland
20617 BRYANTOWN Maryland
20618 BUSHWOOD Maryland
20619 CALIFORNIA Maryland
20620 CALLAWAY Maryland
20621 CHAPTICO Maryland
20621 MADDOX Maryland
20623 CHELTENHAM Maryland
20624 CLEMENTS Maryland
20625 COBB ISLAND Maryland
20626 COLTONS POINT Maryland
20627 COMPTON Maryland
20628 DAMERON Maryland
20630 DRAYDEN Maryland
20634 GREAT MILLS Maryland
20635 HELEN Maryland
20636 HOLLYWOOD Maryland
20640 INDIAN HEAD Maryland
20640 PISGAH Maryland
20643 IRONSIDES Maryland
20645 ISSUE Maryland
20645 SWAN POINT Maryland
20646 DENTSVILLE Maryland
20646 LA PLATA Maryland
20646 LAPLATA Maryland
20650 LEONARDTOWN Maryland
20653 LEX PK Maryland
20653 LEXINGTON PARK Maryland
20653 LEXINGTON PK Maryland
20656 LOVEVILLE Maryland
20658 MARBURY Maryland
20658 RISON Maryland
20659 MECHANICSVILLE Maryland
20659 MECHANICSVLLE Maryland
20660 MORGANZA Maryland
20661 MOUNT VICTORIA Maryland
20661 MT VICTORIA Maryland
20662 NANJEMOY Maryland
20664 NEWBURG Maryland
20667 PARK HALL Maryland
20670 PATUXENT RIVER Maryland
20670 PATUXENT RIVER NAVAL AIR STA Maryland
20670 PATUXENT RVR Maryland
20674 PINEY POINT Maryland
20674 PINEY PT Maryland
20675 POMFRET Maryland
20677 PORT TOBACCO Maryland
20680 RIDGE Maryland
20682 ROCK POINT Maryland
20682 ROCK PT Maryland
20684 BEACHVILLE Maryland
20684 SAINT INIGOES Maryland
20684 ST INIGOES Maryland
20686 SAINT MARYS Maryland
20686 SAINT MARYS CITY Maryland
20686 ST MARYS CITY Maryland
20687 SCOTLAND Maryland
20690 TALL TIMBERS Maryland
20692 VALLEY LEE Maryland
20693 WELCOME Maryland
20695 WHITE PLAINS Maryland
20697 SOUTHERN MD BRM Maryland
20697 SOUTHERN MD FACILITY Maryland
20697 STHRN MD FAC Maryland
20703 LANHAM Maryland
20703 LANHAM SEABROOK Maryland
20703 SEABROOK Maryland
20704 BELTSVILLE Maryland
20705 BELTSVILLE Maryland
20705 CALVERTON Maryland
20706 GLENARDEN Maryland
20706 LANHAM Maryland
20706 LANHAM SEABROOK Maryland
20706 SEABROOK Maryland
20707 LAUREL Maryland
20708 LAUREL Maryland
20708 MONTPELIER Maryland
20709 LAUREL Maryland
20709 MONTPELIER Maryland
20710 BLADENSBURG Maryland
20711 LOTHIAN Maryland
20712 MOUNT RAINIER Maryland
20712 MT RAINIER Maryland
20715 BOWIE Maryland
20716 BOWIE Maryland
20716 MITCHELLVILLE Maryland
20716 S BOWIE Maryland
20716 SOUTH BOWIE Maryland
20717 BOWIE Maryland
20717 MITCHELLVILLE Maryland
20718 BOWIE Maryland
20719 BOWIE Maryland
20719 W BOWIE Maryland
20720 BOWIE Maryland
20721 BOWIE Maryland
20721 MITCHELLVILLE Maryland
20722 BRENTWD Maryland
20722 BRENTWOOD Maryland
20722 COLMAR MANOR Maryland
20722 COTTAGE CITY Maryland
20722 N BRENTWOOD Maryland
20722 NORTH BRENTWOOD Maryland
20723 LAUREL Maryland
20723 SCAGGSVILLE Maryland
20724 LAUREL Maryland
20724 MARYLAND CITY Maryland
20724 MD CITY Maryland
20724 RUSSETT Maryland
20725 LAUREL Maryland
20726 LAUREL Maryland
20731 CAPITOL HEIGHTS Maryland
20731 CAPITOL HGTS Maryland
20735 CLINTON Maryland
20737 RIVERDALE Maryland
20737 RIVERDALE PARK Maryland
20737 RIVERDALE PK Maryland
20738 RIVERDALE Maryland
20740 BERWYN Maryland
20740 BERWYN HEIGHTS Maryland
20740 BERWYN HTS Maryland
20740 COLLEGE PARK Maryland
20740 NORTH COLLEGE PARK Maryland
20741 COLLEGE PARK Maryland
20742 COLLEGE PARK Maryland
20742 UNIVERSITY OF MARYLAND Maryland
20743 CAPITOL HEIGHTS Maryland
20743 CAPITOL HGTS Maryland
20743 FAIRMOUNT HEIGHTS Maryland
20743 FAIRMOUNT HGT Maryland
20743 SEAT PLEASANT Maryland
20744 FORT WASHINGTON Maryland
20744 FT WASHINGTON Maryland
20745 FOREST HEIGHTS Maryland
20745 FOREST HTS Maryland
20745 NATIONAL HARBOR Maryland
20745 OXON HILL Maryland
20746 CAMP SPRINGS Maryland
20746 HILLCREST HGTS Maryland
20746 HILLCREST HTS Maryland
20746 MARLOW HEIGHTS Maryland
20746 MORNINGSIDE Maryland
20746 SILVER HILL Maryland
20746 SUITLAND Maryland
20747 DISTRICT HEIGHTS Maryland
20747 DISTRICT HTS Maryland
20747 FORESTVILLE Maryland
20748 CAMP SPRINGS Maryland
20748 HILLCREST HEIGHTS Maryland
20748 HILLCREST HTS Maryland
20748 MARLOW HEIGHTS Maryland
20748 MARLOW HGTS Maryland
20748 TEMPLE HILLS Maryland
20749 FORT WASHINGTON Maryland
20749 FT WASHINGTON Maryland
20750 OXON HILL Maryland
20752 SUITLAND Maryland
20753 DISTRICT HEIGHTS Maryland
20753 DISTRICT HTS Maryland
20753 FORESTVILLE Maryland
20755 FORT GEORGE G MEADE Maryland
20755 FORT GEORGE MEADE Maryland
20755 FORT MEADE Maryland
20755 FT GEORGE G MEADE Maryland
20755 FT MEADE Maryland
20757 TEMPLE HILLS Maryland
20762 ANDREWS AFB Maryland
20762 ANDREWS AIR FORCE BASE Maryland
20762 JB ANDREWS Maryland
20768 GREENBELT Maryland
20769 GLENN DALE Maryland
20770 GREENBELT Maryland
20771 GODDARD FLIGHT CENTER Maryland
20771 GREENBELT Maryland
20772 MARLBORO Maryland
20772 UPPER MARLBORO Maryland
20772 UPPR MARLBORO Maryland
20773 UPPER MARLBORO Maryland
20773 UPPR MARLBORO Maryland
20774 GLENARDEN Maryland
20774 KETTERING Maryland
20774 LARGO Maryland
20774 SPRINGDALE Maryland
20774 UPPER MARLBORO Maryland
20774 UPPR MARLBORO Maryland
20774 UPR MARLBORO Maryland
20775 KETTERING Maryland
20775 UPPER MARLBORO Maryland
20775 UPPR MARLBORO Maryland
20781 AVONDALE Maryland
20781 CHEVERLY Maryland
20781 EDMONSTON Maryland
20781 HYATTSVILLE Maryland
20781 ROGERS HEIGHTS Maryland
20781 TUXEDO Maryland
20782 AVONDALE Maryland
20782 CHILLUM Maryland
20782 GREEN MEADOW Maryland
20782 HYATTSVILLE Maryland
20782 LEWISDALE Maryland
20782 PRINCE GEORGES METRO CTR Maryland
20782 UNIVERSITY PA Maryland
20782 UNIVERSITY PARK Maryland
20782 W HYATTSVILLE Maryland
20782 WEST HYATTSVILLE Maryland
20783 ADELPHI Maryland
20783 HYATTSVILLE Maryland
20783 LANGLEY PARK Maryland
20784 CHEVERLY Maryland
20784 HYATTSVILLE Maryland
20784 LANDOVER HILLS Maryland
20784 LANDOVER HLS Maryland
20784 LANHAM Maryland
20784 NEW CARROLLTN Maryland
20784 NEW CARROLLTON Maryland
20785 ARDMORE Maryland
20785 CHEVERLY Maryland
20785 HYATTSVILLE Maryland
20785 LANDOVER Maryland
20785 N ENGLEWOOD Maryland
20785 NORTH ENGLEWOOD Maryland
20785 PALMER PARK Maryland
20787 HYATTSVILLE Maryland
20787 LANGLEY PARK Maryland
20788 HYATTSVILLE Maryland
20788 PRINCE GEORGE PLAZA Maryland
20788 W HYATTSVILLE Maryland
20790 CAPITOL HEIGHTS Maryland
20790 CAPITOL HGTS Maryland
20790 SOUTHERN MARYLAND FACILITY Maryland
20791 CAPITOL HEIGHTS Maryland
20791 CAPITOL HGTS Maryland
20792 LARGO Maryland
20792 UPPER MARLBORO Maryland
20792 UPPR MARLBORO Maryland
20797 SOUTHERN MD BRM Maryland
20797 SOUTHERN MD FACILITY Maryland
20797 STHRN MD FAC Maryland
20799 CAPITOL HEIGHTS Maryland
20799 CAPITOL HGTS Maryland
20799 WASHINGTON NDC Maryland
20810 BETHESDA Maryland
20810 GEICO Maryland
20811 BETHESDA Maryland
20811 GEICO Maryland
20812 GLEN ECHO Maryland
20813 BETHESDA Maryland
20814 BETHESDA Maryland
20815 BETHESDA Maryland
20815 CHEVY CHASE Maryland
20815 CHEVY CHASE VILLAGE Maryland
20815 CHEVY CHS VLG Maryland
20815 MARTINS ADD Maryland
20815 MARTINS ADDITIONS Maryland
20815 N CHEVY CHASE Maryland
20815 NORTH CHEVY CHASE Maryland
20815 SOMERSET Maryland
20816 BETHESDA Maryland
20817 BETHESDA Maryland
20817 WESTLAKE Maryland
20818 CABIN JOHN Maryland
20824 BETHESDA Maryland
20825 BETHESDA Maryland
20825 CHEVY CHASE Maryland
20827 BETHESDA Maryland
20827 W BETHESDA Maryland
20827 WESTLAKE Maryland
20830 OLNEY Maryland
20832 OLNEY Maryland
20833 BROOKEVILLE Maryland
20833 SUNSHINE Maryland
20833 UNITY Maryland
20837 POOLESVILLE Maryland
20838 BARNESVILLE Maryland
20839 BEALLSVILLE Maryland
20841 BOYDS Maryland
20842 COMUS Maryland
20842 DICKERSON Maryland
20847 ROCKVILLE Maryland
20848 ROCKVILLE Maryland
20849 ROCKVILLE Maryland
20850 POTOMAC Maryland
20850 ROCKVILLE Maryland
20851 ROCKVILLE Maryland
20852 N BETHESDA Maryland
20852 NO BETHESDA Maryland
20852 NORTH BETHESDA Maryland
20852 ROCKVILLE Maryland
20853 ROCKVILLE Maryland
20854 POTOMAC Maryland
20854 ROCKVILLE Maryland
20855 DERWOOD Maryland
20855 ROCKVILLE Maryland
20857 HHS Maryland
20857 ROCKVILLE Maryland
20859 POTOMAC Maryland
20859 ROCKVILLE Maryland
20860 SANDY SPRING Maryland
20861 ASHTON Maryland
20862 BRINKLOW Maryland
20866 BURTONSVILLE Maryland
20868 SPENCERVILLE Maryland
20871 CLARKSBURG Maryland
20871 HYATTSTOWN Maryland
20872 DAMASCUS Maryland
20874 DARNESTOWN Maryland
20874 GERMANTOWN Maryland
20875 GERMANTOWN Maryland
20876 GERMANTOWN Maryland
20877 GAITHERSBURG Maryland
20877 MONTGOMERY VILLAGE Maryland
20877 MONTGOMRY VLG Maryland
20878 DARNESTOWN Maryland
20878 GAITHERSBURG Maryland
20878 N POTOMAC Maryland
20878 NO POTOMAC Maryland
20878 NORTH POTOMAC Maryland
20879 GAITHERSBURG Maryland
20879 MONTGOMERY VILLAGE Maryland
20879 MONTGOMRY VLG Maryland
20880 WASHINGTN GRV Maryland
20880 WASHINGTON GROVE Maryland
20882 BROOKEVILLE Maryland
20882 GAITHERSBURG Maryland
20882 LAYTONSVILLE Maryland
20883 GAITHERSBURG Maryland
20884 GAITHERSBURG Maryland
20885 GAITHERSBURG Maryland
20886 GAITHERSBURG Maryland
20886 MONTGOMERY VILLAGE Maryland
20886 MONTGOMRY VLG Maryland
20889 BETHESDA Maryland
20889 NATIONAL NAVAL MEDICAL CTR Maryland
20889 WALTER REED NATL MIL MED CTR Maryland
20891 KENSINGTON Maryland
20892 BETHESDA Maryland
20892 NATIONAL INSTITUTE OF HEALTH Maryland
20894 BETHESDA Maryland
20894 NATIONAL LIBRARY OF MEDICINE Maryland
20895 KENSINGTON Maryland
20895 NORTH BETHESDA Maryland
20896 GARRETT PARK Maryland
20897 SUBN MD FAC Maryland
20897 SUBURB MARYLAND FAC Maryland
20897 SUBURBAN MD BRM Maryland
20898 GAITHERSBURG Maryland
20899 GAITHERSBURG Maryland
20899 NATL INST STDS & TECH MD Maryland
20901 SILVER SPRING Maryland
20901 TAKOMA PARK Maryland
20902 SILVER SPRING Maryland
20902 WHEATON Maryland
20903 HILLANDALE Maryland
20903 SILVER SPRING Maryland
20904 CLOVERLY Maryland
20904 COLESVILLE Maryland
20904 SILVER SPRING Maryland
20905 CLOVERLY Maryland
20905 COLESVILLE Maryland
20905 SANDY SPRING Maryland
20905 SILVER SPRING Maryland
20906 ASPEN HILL Maryland
20906 GLENMONT Maryland
20906 LEISURE WORLD Maryland
20906 NORBECK Maryland
20906 SILVER SPRING Maryland
20906 WHEATON Maryland
20907 SILVER SPRING Maryland
20908 SILVER SPRING Maryland
20910 SILVER SPRING Maryland
20910 TAKOMA PK Maryland
20911 SILVER SPRING Maryland
20912 SILVER SPRING Maryland
20912 TAKOMA PARK Maryland
20913 SILVER SPRING Maryland
20913 TAKOMA PARK Maryland
20914 COLESVILLE Maryland
20914 SILVER SPRING Maryland
20915 SILVER SPRING Maryland
20915 WHEATON Maryland
20916 ASPEN HILL Maryland
20916 SILVER SPRING Maryland
20918 SILVER SPRING Maryland
20993 SILVER SPRING Maryland
20993 US FOOD AND DRUG ADMIN Maryland
20997 SILVER SPRING Maryland
20997 SUBURBAN MD BRM Maryland
21035 DAVIDSONVILLE Maryland
21037 EDGEWATER Maryland
21044 COLUMBIA Maryland
21045 COLUMBIA Maryland
21046 COLUMBIA Maryland
21106 MAYO Maryland
21140 RIVA Maryland
21150 SIMPSONVILLE Maryland
21501 CUMBERLAND Maryland
21502 CRESAPTOWN Maryland
21502 CUMBERLAND Maryland
21502 LAVALE Maryland
21503 CUMBERLAND Maryland
21504 CUMBERLAND Maryland
21504 LAVALE Maryland
21505 CRESAPTOWN Maryland
21505 CUMBERLAND Maryland
21520 ACCIDENT Maryland
21521 BARTON Maryland
21522 BITTINGER Maryland
21523 BLOOMINGTON Maryland
21524 CORRIGANVILLE Maryland
21528 ECKHART MINES Maryland
21529 ELLERSLIE Maryland
21531 FRIENDSVILLE Maryland
21532 FROSTBURG Maryland
21536 GRANTSVILLE Maryland
21536 JENNINGS Maryland
21538 KITZMILLER Maryland
21538 SHALLMAR Maryland
21539 LONACONING Maryland
21540 LUKE Maryland
21540 WESTERNPORT Maryland
21541 MC HENRY Maryland
21541 MCHENRY Maryland
21541 SANG RUN Maryland
21542 MIDLAND Maryland
21543 MIDLOTHIAN Maryland
21545 MOUNT SAVAGE Maryland
21550 CRELLIN Maryland
21550 DEER PARK Maryland
21550 HUTTON Maryland
21550 LOCH LYN HGHT Maryland
21550 LOCH LYNN HEIGHTS Maryland
21550 MNT LAKE PARK Maryland
21550 MOUNTAIN LAKE PARK Maryland
21550 MT LAKE PARK Maryland
21550 MTN LK PARK Maryland
21550 OAKLAND Maryland
21555 OLDTOWN Maryland
21556 PINTO Maryland
21557 RAWLINGS Maryland
21560 SPRING GAP Maryland
21561 SWANTON Maryland
21562 MCCOOLE Maryland
21562 WESTERNPORT Maryland
21701 FREDERICK Maryland
21701 HOOD COLLEGE Maryland
21701 LEWISTOWN Maryland
21702 COLLEGE ESTATES Maryland
21702 FORT DETRICK Maryland
21702 FREDERICK Maryland
21703 FREDERICK Maryland
21704 FREDERICK Maryland
21704 URBANA Maryland
21705 FREDERICK Maryland
21709 FREDERICK Maryland
21709 STATE FARM INS CO Maryland
21710 ADAMSTOWN Maryland
21710 DOUBS Maryland
21711 BIG POOL Maryland
21713 BOONSBORO Maryland
21714 BRADDOCK HEIGHTS Maryland
21714 BRADDOCK HTS Maryland
21715 BROWNSVILLE Maryland
21716 BRUNSWICK Maryland
21716 KNOXVILLE Maryland
21717 BUCKEYSTOWN Maryland
21718 BURKITTSVILLE Maryland
21719 CASCADE Maryland
21719 FORT RITCHIE Maryland
21719 HIGHFIELD Maryland
21720 CAVETOWN Maryland
21721 CHEWSVILLE Maryland
21722 BIG SPRING Maryland
21722 CLEAR SPRING Maryland
21727 EMMITSBURG Maryland
21733 FAIRPLAY Maryland
21733 ST JAMES Maryland
21734 FUNKSTOWN Maryland
21740 HAGERSTOWN Maryland
21741 HAGERSTOWN Maryland
21742 HAGERSTOWN Maryland
21742 NORTHERN Maryland
21746 HAGERSTOWN Maryland
21746 MD CORRECTIONAL SYSTEM Maryland
21747 HAGERSTOWN Maryland
21749 CITICORP BRM Maryland
21749 HAGERSTOWN Maryland
21750 HANCOCK Maryland
21755 JEFFERSON Maryland
21756 KEEDYSVILLE Maryland
21758 BRUNSWICK Maryland
21758 KNOXVILLE Maryland
21759 LADIESBURG Maryland
21762 LIBERTYTOWN Maryland
21767 MAUGANSVILLE Maryland
21769 MIDDLETOWN Maryland
21770 MONROVIA Maryland
21771 MOUNT AIRY Maryland
21773 MYERSVILLE Maryland
21774 LAKE LINGANORE Maryland
21774 NEW MARKET Maryland
21775 NEW MIDWAY Maryland
21777 POINT OF ROCKS Maryland
21777 PT OF ROCKS Maryland
21778 ROCKY RIDGE Maryland
21779 GAPLAND Maryland
21779 ROHRERSVILLE Maryland
21780 SABILLASVILLE Maryland
21781 SAINT JAMES Maryland
21782 SHARPSBURG Maryland
21783 SMITHSBURG Maryland
21788 GRACEHAM Maryland
21788 THURMONT Maryland
21790 TUSCARORA Maryland
21792 UNIONVILLE Maryland
21793 WALKERSVILLE Maryland
21795 WILLIAMSPORT Maryland
21798 WOODSBORO Maryland

FAQ


Where is area code 301?

The Area code 301 is located in Maryland and includes the following cities:
  • Aspen Hill
  • North Bethesda
  • Bowie
  • Chillum
  • Clinton
  • College Park
  • Cumberland
  • Fairland
  • Fort Washington
  • Frederick
  • Gaithersburg
  • Germantown
  • Greenbelt
  • Hagerstown
  • Landover
  • Montgomery Village
  • North Bethesda
  • South Laurel
  • North Potomac
  • Olney
  • Potomac
  • Rockville
  • Silver Spring
  • South Laurel
  • Saint Charles
  • Suitland
  • Waldorf
  • White Oak