Maryland area codes
Maryland has 6 area codes, all on UTC−5 standard time. Each card shows the main cities; open one for its overlays, history and a free lookup.
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Maryland area code questions
How many area codes does Maryland have?
Maryland has 6 area codes in service: 227, 240, 301, 410, 443 and 667.
What was the original Maryland area code?
301 was among the original area codes created in 1947.
What is the newest area code in Maryland?
227, in service since June 14, 2023 as an overlay on 240 and 301.
What time zone is Maryland area codes in?
Eastern.
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All North American area codes · International country codes
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.