Area codes in Baltimore, Maryland
Baltimore, Maryland uses 3 area codes — 410, 443 and 667. The main Baltimore area code is 410.
Area codes serving Baltimore
Phone numbers in Baltimore are written as ten digits — for example (410) 555-0190 — and fall in the Eastern Time zone.
How Baltimore came to have 3 area codes
The original Baltimore area code is 410, in service since 1991. As the area ran low on available numbers, overlay codes were added over the same region for new phone lines: 443 (1997) and 667 (2012). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Baltimore now uses all 3 codes and every local call is dialed with ten digits.
All Maryland area codes · Is a Baltimore call a scam?
Nearby cities
- Annapolis area codes
- Silver Spring area codes
- Washington area codes
- Rockville area codes
- Alexandria area codes
- Fairfax area codes
- Frederick area codes
- Manassas area codes
More cities in Maryland
Frequently asked questions
What is the area code for Baltimore?
The main area code for Baltimore, Maryland is 410. Baltimore is now served by 3 area codes in total: 410, 443, 667.
How many area codes does Baltimore have?
Baltimore has 3 area codes: 410, 443, 667.
Why does Baltimore have more than one area code?
As Baltimore used up the numbers available in its original area code (410, in service since 1991), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Baltimore number?
Dial all 10 digits — the area code (410 or 443 or 667) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.