WHAT YOU NEED TO KNOW
Area code 667 serves the Baltimore metro area in Maryland, covering cities including Baltimore, Towson, Dundalk, and Catonsville. Established in 2012 as an overlay to the existing 410 and 443 codes, the area code covers approximately 2.9 million residents and is one of three active local codes serving the greater Baltimore region.
- Population: approximately 2.9 million residents in the metro
- Overlay: Overlay: 410 and 443
- Dialing: 10-digit dialing required
- Source Type: Local geographic code
Geographic Coverage
Area code 667 covers Baltimore City and much of Baltimore County, Maryland. Major communities served include Baltimore, Towson, Dundalk, Catonsville, Essex, Parkville, Pikesville, Rosedale, Middle River, Owings Mills, Lutherville-Timonium, Perry Hall, White Marsh, Randallstown, and Cockeysville. The code also reaches portions of Harford County and Anne Arundel County within the broader Baltimore metro footprint, making it one of the most geographically expansive codes in the state.
Population and Business Context
The Baltimore metro area served by 667 is home to roughly 2.9 million people and represents Maryland's largest economic hub. Key industries include healthcare and life sciences anchored by Johns Hopkins Medicine and the University of Maryland Medical System, logistics tied to the Port of Baltimore, financial services, federal government contracting, and education. Small and mid-size businesses are concentrated in Towson, Owings Mills, and the Baltimore City commercial corridors.
Area Code History
Area code 667 was introduced in 2012 by the North American Numbering Plan Administrator as a relief overlay for the 410 and 443 codes, which had been exhausting available number capacity in the Baltimore region. The original 410 code was assigned to Maryland in 1991 when 301 was split, and 443 followed in 1997 as a first overlay. The addition of 667 created a three-code overlay complex to accommodate continued demand for new phone numbers in the metro area.
How to Dial
Because 667 operates as part of a three-code overlay with 410 and 443, all calls within the Baltimore area require 10-digit dialing, meaning you must dial the full area code plus the seven-digit local number for every call, including those to neighbors using the same area code. There is no need to dial a leading 1 for local calls. Long-distance calls outside the overlay region follow the standard 1 plus 10-digit format.
Need a 667 Number for Your Baltimore Business?
Businesses operating in Baltimore and the surrounding metro area can provision a 667 local tracking number through Convirza. Whether you are running campaigns across multiple Baltimore neighborhoods or targeting specific counties, a local 667 number builds regional trust while giving you full visibility into inbound call performance. Convirza provisions trackable local numbers in any North American area code with no hardware required. Every call to your 667 number is automatically recorded, scored for quality and intent, and attributed to its traffic source using dynamic number insertion (DNI). Calls can be routed to any team member, office location, or call center in real time. You get a clear picture of which campaigns are driving phone leads, so you can make faster, data-backed decisions.
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