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74 zip codes in the 301 area code
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Cities and zips in ALLEGANY County:
BARTON: 21521
CORRIGANVILLE: 21524
ELLERSLIE: 21529
FLINTSTONE: 21530
LITTLE ORLEANS: 21766
LONACONING: 21539
LUKE: 21540
MIDLAND: 21542
MOUNT SAVAGE: 21545
OLDTOWN: 21555

Cities and zips in CHARLES County:
BRYANS ROAD: 20616
POMFRET: 20675
WHITE PLAINS: 20695

Cities and zips in FREDERICK County:
BRUNSWICK: 21716
BURKITTSVILLE: 21718
JEFFERSON: 21755
KNOXVILLE: 21758
LADIESBURG: 21759
NEW MARKET: 21774
NEW MIDWAY: 21775
UNIONVILLE: 21792
WALKERSVILLE: 21793
WOODSBORO: 21798

Cities and zips in GARRETT County:
ACCIDENT: 21520
BITTINGER: 21522
BLOOMINGTON: 21523
FRIENDSVILLE: 21531
KITZMILLER: 21538
MC HENRY: 21541
SWANTON: 21561

Cities and zips in HOWARD County:
DHS: 20588

Cities and zips in MONTGOMERY County:
BURTONSVILLE: 20866
GAITHERSBURG: 20878
GERMANTOWN: 20875 20874
POTOMAC: 20859 20854
SILVER SPRING: 20914 20904 20903 20905
SPENCERVILLE: 20868
TAKOMA PARK: 20912 20913

Cities and zips in PRINCE GEORGES County:
ACCOKEEK: 20607
BLADENSBURG: 20710
BOWIE: 20716 20721
HYATTSVILLE: 20783 20787 20784

Cities and zips in SAINT MARYS County:
ABELL: 20606
AVENUE: 20609
BUSHWOOD: 20618
CALIFORNIA: 20619
CHAPTICO: 20621
CLEMENTS: 20624
COLTONS POINT: 20626
COMPTON: 20627
DRAYDEN: 20630
HOLLYWOOD: 20636
LOVEVILLE: 20656
MORGANZA: 20660
PINEY POINT: 20674
VALLEY LEE: 20692

Cities and zips in WASHINGTON County:
BIG POOL: 21711
BOONSBORO: 21713
BROWNSVILLE: 21715
CLEAR SPRING: 21722
FAIRPLAY: 21733
KEEDYSVILLE: 21756
ROHRERSVILLE: 21779
SAINT JAMES: 21781
SHARPSBURG: 21782

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