Area codes / Maryland

Maryland area codes

Maryland has 6 area codes in service, in the Eastern time zone. Pick one for a local business number your Maryland customers recognize.

Every Maryland area code

Maryland area codes with time zone, overlays, and year in service
Area code	Time zone	Overlaid with	In service since
227	Eastern	240, 301	2023
240	Eastern	227, 301	1997
301	Eastern	240, 227	1947
410	Eastern	443, 667	1991
443	Eastern	410, 667	1997
667	Eastern	410, 443	2012

Picking a Maryland area code

301 is among the original area codes created in 1947. 6 Maryland area codes share their region with an overlay, so a new number there may come in either code; both ring the same area, and calls within it are dialed with all ten digits.

Already have a Maryland number customers know? Move it to Onyx Phone for free, and keep answering while it moves.

Getting started

Create a login and pick a plan. Checkout saves a card for the 7-day free trial, and nothing is charged until it ends.
Confirm your business and its 911 address, and get a local number on the spot. Bringing your own number? You answer on a temporary one while it moves over, for free.
Choose where calls ring, write what callers hear, invite your team, and register for texting. Then answer in the browser, the iPhone and Android apps, or a desk phone. How it works has the details.

Included on every plan

Starter is $17, Business is $29, Scale is $42 per user a month, or less billed yearly. The plan includes a business number for each user and unlimited calling and texting in the US and Canada. Every plan starts with a 7-day free trial, and moving your current number over is free.

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Area code data from NANPA, file of October 24, 2026.