Maryland area codes

Explore all 6 area codes in Maryland. Choose a code to see its coverage, dialing rules, and phone lookup.

All 6 area codes in Maryland

  • 227

    Frederick, Myersville

  • 240

    Frederick, Hagerstown

  • 301

    Frederick, Waldorf

  • 410

    Baltimore, Towson

  • 443

    Baltimore, Annapolis

  • 667

    Baltimore, Salisbury

Maryland area code questions

How many area codes does Maryland have?

Maryland has 6 active geographic area codes in this directory: 227, 240, 301, 410, 443 and 667.

Which area code should I choose in Maryland?

Start with the first three digits after +1 on the number you want to check. The codes in this directory are associated with places including Frederick and Baltimore. The listed places are examples, not a complete map of each code’s boundaries.

Which Maryland area codes share coverage?

NANPA groups these codes in shared numbering complexes: 227 / 240 / 301; 410 / 443 / 667. Members can serve overlapping areas; being in the same complex does not necessarily mean identical geographic boundaries.

How do I dial a number in Maryland?

Open the individual area code to check its local dialing rule. For a phone lookup, enter +1 followed by the three-digit area code and the seven-digit number. A state or area code alone is not enough to look up a particular number.

Does an area code from Maryland show where the caller is?

No. An area code describes a number’s assigned region. People can keep numbers after moving, use them while traveling, or place internet-based calls. Caller ID can also be spoofed, so the code does not confirm the caller’s location or identity.