Maryland · Eastern Time
667 Area Code
The 667 area code is a telephone area code in Maryland, covering Baltimore and the surrounding area. It lies in the Eastern Time zone.
Last updated June 5, 2026
Where is the 667 area code?
667 serves Baltimore and nearby communities in Maryland. In the wider directory it sits in the South region.
Overlay codes serving Baltimore
Baltimore is served by an overlay of 3 area codes: 410, 443, 667. Because more than one code covers the same area, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes, so Baltimore numbers are no longer tied to a single prefix.
History of the 667 area code
667 was introduced as an overlay to relieve number exhaustion in the Baltimore area, adding capacity on top of 410 rather than splitting the region. Overlays let existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 667 a scam or spam risk?
667 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 667 number on your screen is no guarantee the caller is local or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Maryland area codes
Explore more
See every code in Maryland, compare codes across the South region, or view all Eastern Time codes. You can also browse the 6XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
667 area code FAQ
Where is the 667 area code?
The 667 area code is in Maryland, serving Baltimore and the surrounding area in the South region.
What time zone is 667 in?
667 is in the Eastern Time zone.
Do I have to dial 10 digits for 667?
Yes. Because Baltimore is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 667 a toll-free or premium code?
No. 667 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.