667 area code — Baltimore, MD geographic
The 667 area code covers Baltimore, Maryland, Eastern time zone, and dates back to March 24, 2012. It is part of the 410/443/667 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 667 number can be used from anywhere — the code marks where the number was assigned.
433 central-office prefixes are currently active in this code, spread across 47 code-holding carriers. Thousands-block pooling applies to 433 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 102 distinct rate centers.
NANPA projects numbering capacity for the 410/443/667 complex to exhaust in 1Q 2036.
Dialing: 10D locally, 10D to other codes (1+10 digit permissible at service provider discretion.).
Practical takeaway: the 667 label narrows geography to Maryland, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.
667 was created from 443 in 2012.
Largest localities in 667
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Baltimore | 72 | 301, 410, 443 |
| Salisbury | 23 | 410, 443 |
| Aberdeen | 23 | 410, 443 |
| Pikesville | 21 | 410, 443 |
| Annapolis | 15 | 410, 443 |
| Catonsville | 12 | 410, 443 |
| Columbia | 11 | 410, 443 |
| Towson | 10 | 410, 443 |
| Odenton | 8 | 410, 443 |
| Bel Air | 7 | 410, 443 |
FAQ
Is 667 a toll-free number?
No. 667 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Why do 410 and 667 cover the same place?
They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 410/443/667 complex shares one service area, and local calls are dialed with 10 digits.
Will 667 run out of numbers?
NANPA's current forecast projects exhaust in 1Q 2036 — decades of capacity remain.
Why am I getting spam calls from 667 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 667 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 667 number from?
667 is assigned to Baltimore and surrounding areas of Maryland in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.