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MARYLAND · STATE GUIDE

Maryland area codes: Baltimore, Frederick, Gaithersburg, and Hagerstown

Local date and time
Eastern Time
PennsylvaniaVirginia301410BaltimoreFrederick

Map data: HSIP (2010) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.

Maryland area codes
Maryland area codes

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Maryland area codes at a glance

Area codes
6
Counties
24
Cities
157
Population (2025)
6.3 million
Time zone
Eastern

History

  1. 1947 · First area codesMaryland started with 301.
  2. 1991 · SplitsOne code split from an existing one.
  3. 1997–2023 · OverlaysFour overlay codes added, so existing numbers kept their codes.
All 6 changes, by date
  1. : 301 started service
  2. : 410 split from 301
  3. : 240 added as an overlay on 301
  4. : 443 added as an overlay on 410
  5. : 667 added as an overlay on 443
  6. : 227 added as an overlay on 301

Area codes by region

RegionKey citiesCitiesArea codes
Baltimore-Columbia-Towson, MDBaltimore, Annapolis, Westminster15227, 240, 301, 410, 443, and 667
Washington-Arlington-Alexandria, DC-VA-MD-WVFrederick, Gaithersburg, La Plata12227, 240, and 301
Hagerstown-Martinsburg, MD-WVHagerstown, Smithsburg, Williamsport6227, 240, and 301
Salisbury, MDSalisbury, Delmar, Princess Anne6410, 443, and 667
Philadelphia-Camden-Wilmington, PA-NJ-DE-MDElkton, Perryville, North East7410, 443, and 667
Cumberland, MD-WVCumberland, Frostburg, Westernport4227, 240, and 301
Easton, MDEaston, Trappe, Saint Michaels4410, 443, and 667
Cambridge, MDCambridge, Hurlock, Vienna3410, 443, and 667
Ocean Pines, MDOcean City, Berlin, Snow Hill3410, 443, and 667
Lexington Park, MDLeonardtown, North Beach2227, 240, 301, 410, 443, and 667
Rest of MarylandChestertown, Denton, Federalsburg14227, 240, 301, 410, 443, and 667

Cities with populations

CityPopulation
Baltimore569,997
Frederick92,059
Gaithersburg71,113
Hagerstown44,228
Annapolis40,634
Salisbury33,845
Westminster20,589
Cumberland18,799
Aberdeen18,374
Easton17,293
Elkton16,670
Havre De Grace15,630
Cambridge13,457
La Plata12,137
Mount Airy9,857
Brunswick9,380
Taneytown8,259
Frostburg6,979
Ocean City6,840
Walkersville6,501
Thurmont6,337
Hampstead6,281
Poolesville5,942
Chestertown5,658
Berlin5,335
Show all 76 cities
CityPopulation
Denton5,075
Middletown5,056
Leonardtown5,033
Delmar4,896
Centreville4,782
Sykesville4,602
Perryville4,592
North East4,237
Indian Head4,202
Princess Anne3,642
Smithsburg3,212
Emmitsburg2,910
Federalsburg2,864
Rising Sun2,761
Crisfield2,555
Snow Hill2,237
North Beach2,179
Hurlock2,123
Williamsport2,112
Greensboro1,962
Myersville1,885
Oakland1,808
Westernport1,759
New Windsor1,749
Ridgely1,630
New Market1,609
Hancock1,581
Trappe1,517
Keedysville1,225
Rock Hall1,208
Saint Michaels1,083
Willards1,018
Lonaconing978
Grantsville954
Union Bridge941
Church Hill817
Chesapeake City749
Queenstown711
Sharptown692
Cecilton691
Preston684
Port Deposit633
Oxford591
Millington544
Galena541
Sudlersville515
Friendsville426
Clear Spring378
Kitzmiller292
Vienna279
Hillsboro133

Notable places and their area codes

PlaceWhereWhat it isArea codes
Johns Hopkins University3.3 km from BaltimoreUniversity, 39,148 12-month enrollment (2023–24)410, 443, and 667
University of Maryland28.2 km from GaithersburgUniversity, 44,110 12-month enrollment (2023–24)227, 240, and 301
Camp David5.7 km from ThurmontMilitary base227, 240, and 301
Baltimore/Washington International Thurgood Marshall Airport5.3 km from SevernCommercial airport, 13,221,461 enplanements (2024)410, 443, and 667
United States Naval Academy2.1 km from AnnapolisUniversity, 4,671 12-month enrollment (2023–24)410, 443, and 667
University of Baltimore0.8 km from BaltimoreUniversity, 3,975 12-month enrollment (2023–24)410, 443, and 667
Northwest Stadium25.1 km from BrandywineStadium227, 240, and 301
Joint Base Andrews14.3 km from BrandywineUS Air Force installation227, 240, and 301
M&T Bank Stadium2.7 km from BaltimoreStadium410, 443, and 667
Aberdeen Proving Ground6.3 km from AberdeenUS Army installation410, 443, and 667

Questions about Maryland area codes

How many area codes does Maryland have?

Maryland has 6 area codes: 227, 240, 301, 410, 443, and 667.

What time zone is Maryland in?

Maryland is in Eastern Time. Daylight saving time is observed.

Which Maryland area codes are overlays?

240 was added as an overlay on 301 on 1 June 1997. 443 was added as an overlay on 410 on 1 June 1997. 667 was added as an overlay on 443 on 24 March 2012. 227 was added as an overlay on 301 on 14 June 2023.

How many counties are in Maryland?

Maryland has 24 counties and equivalents (Census Bureau, 2025).

What cities have area codes in Maryland?

Maryland has 157 incorporated places. The largest are Baltimore, Frederick, Gaithersburg, Hagerstown, and Annapolis.

Are Maryland area codes toll free?

No. Maryland's area codes are all geographic. The toll-free codes are 800, 833, 844, 855, 866, 877, and 888.

Sources: population, US Census Bureau state population estimates, 2025 (state-wide; not an area-code population). Area codes and in-service dates, the North American Numbering Plan Administrator.

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