667 Area Code: Baltimore, Maryland — Location, Cities, Time Zone & Complete Guide

Introduction

The 667 area code is a telephone overlay code assigned to Baltimore and most of central and eastern Maryland under the North American Numbering Plan. Whether you received a call from a 667 area code number or want to establish a credible business presence in one of the Mid-Atlantic's most strategically active cities, knowing this code is a direct advantage. This guide covers every major city in the 667 territory, Eastern Time zone details, the overlay history, scam awareness, and how to activate a virtual local line. Everything you need to navigate Baltimore's market and make confident decisions about local Maryland numbers is right here.

Key Takeaways

• The 667 area code launched in 2012 as the third telephone overlay for Maryland's 410/443 territory, created to meet sustained growth in phone number demand across the Baltimore metro.
• Baltimore, Annapolis, Columbia, Towson, and Glen Burnie are among the most economically active communities served within the 667 zone.
• The entire 667 region operates on Eastern Time, placing it in the same zone as Washington D.C., Philadelphia, and New York.
• Because 667 is an overlay code, ten-digit dialing is mandatory for all local calls — seven-digit dialing is not available within this zone.
• You can activate a virtual 667 number from anywhere in the world with no Maryland address, SIM card, or carrier contract required.

What Is the 667 Area Code?

The 667 area code is a telephone overlay code covering the same geographic territory as Maryland's 410 and 443 area codes. Introduced in 2012 to address growing demand for phone numbers in the Baltimore metro and surrounding counties, 667 was the third concurrent prefix added to this zone. Any number carrying a 667 area code prefix corresponds to a location within central or eastern Maryland, sharing that territory with both 410 and 443 simultaneously.

Overlay Code, Not a Geographic Split

Because 667 is a true overlay, callers cannot use seven-digit dialing for local calls within the zone — ten-digit dialing is mandatory for every call. This matters for businesses running multi-line VoIP systems, phone trees, or automated call platforms in the Baltimore area, all of which must be configured for full ten-digit local dialing.

Where Is Area Code 667 Located?

Area Code 667 covers the central and eastern portions of Maryland — the same geography as the 410 and 443 prefixes. This includes Baltimore City, the surrounding counties, the state capital, and a large stretch of the Eastern Shore.

• Baltimore City — Maryland's largest city and economic anchor
• Baltimore County — Towson, Dundalk, Catonsville, Essex, Pikesville
• Anne Arundel County — Annapolis, Glen Burnie, Laurel, Pasadena
• Howard County — Columbia, Ellicott City
• Harford County — Bel Air, Aberdeen, Havre de Grace
• Carroll County — Westminster
• Eastern Shore — Salisbury, Ocean City, Cambridge, Easton

The western Maryland counties and DC-suburb jurisdictions — Montgomery County and Prince George's County — fall under the 301 and 240 codes and sit outside the 667 zone.

Major Cities in the 667 Area Code

The 667 area code serves some of the most economically and historically significant communities in the eastern United States.

Baltimore

Baltimore is the commercial heart of the 667 area code and Maryland's largest city, with a population exceeding 585,000 residents. The Inner Harbor, Fort McHenry, Oriole Park at Camden Yards, and Johns Hopkins Medical Campus all fall within the 667 footprint. The Port of Baltimore — one of the busiest auto import-export terminals in the US — drives sustained shipping, logistics, and trade activity that generates dense commercial telecom demand across the region.

Annapolis and Columbia

Annapolis, Maryland's state capital, brings consistent government, legislative, and legal telecom demand to the 667 territory. Columbia, in Howard County, is one of the largest planned communities in the US and hosts major corporate campuses, healthcare facilities, and retail corridors generating year-round business activity. The 202 area code covering Washington D.C. lies directly to the southwest — businesses active in both the Baltimore and DC markets bridge these two zones daily.

Towson, Glen Burnie, and the Baltimore Suburbs

Towson is Baltimore County's administrative seat and one of the region's most active commercial corridors, anchored by Towson University and a dense concentration of professional services firms. Glen Burnie, along Route 2 in Anne Arundel County, is a logistics and automotive services hub connecting Baltimore and Annapolis along the county's busiest transport routes. These suburban communities reflect the 667 zone's economic depth well beyond Baltimore's city limits.

667 Area Code Time Zone

The 667 area code operates entirely on Eastern Time. In winter, the region observes Eastern Standard Time (EST, UTC−5). From the second Sunday in March through the first Sunday in November, it shifts to Eastern Daylight Time (EDT, UTC−4), following the standard US daylight saving schedule.

Maryland's Eastern Time places the 667 zone directly in line with the 215 area code covering Philadelphia and all major East Coast commercial markets. For West Coast contacts, Baltimore runs three hours ahead of Los Angeles. The optimal calling window from the Pacific Coast into the 667 zone is 6 AM to 2 PM Pacific, reaching Maryland businesses between 9 AM and 5 PM local time and covering the full business day on both coasts.

History of the 667 Area Code

The 301 to 410 Split

Maryland operated under the 301 area code until population growth and business expansion — particularly in the Baltimore metro through the 1970s and 1980s — pushed available numbers toward exhaustion. On November 1, 1991, NANPA executed a geographic split: the DC suburbs and western Maryland retained 301, and central and eastern Maryland including Baltimore received the 410 area code.

The 443 and 667 Overlays

Mobile phone adoption and internet expansion in the late 1990s pushed 410 rapidly toward depletion. In 1997, the 443 area code was introduced as Maryland's first telephone overlay, sharing the 410 territory without displacing any existing numbers. By the late 2000s, combined demand across 410 and 443 created the need for a third code. In 2012, the 667 code was activated as a second overlay for the 410/443 region — giving the Baltimore corridor its third concurrent prefix. According to NANPA's numbering resources, overlay codes like 667 preserve all existing phone numbers while creating new capacity for a growing region.

How to Get a Virtual Phone Number from CallMama

CallMama makes it simple to activate a virtual 667 phone number from anywhere in the world — no Maryland address, no physical SIM card, and no long-term carrier contract required. The platform provides HD voice calling, two-way SMS, voicemail management, and instant call forwarding, all accessible from a single mobile app.

1. Visit callmama.com or download the CallMama app from the App Store or Google Play.
2. Create a free account using your email address.
3. Choose a plan that fits your needs — monthly or pay-as-you-go options are available.
4. Select your virtual number: choose United States, then filter by the 667 area code.
5. Complete payment and activate your 667 number instantly — full setup in under five minutes.
6. Configure call forwarding, voicemail, and SMS settings to match your workflow.
7. Start making and receiving calls from any device, anywhere in the world.

Why Businesses Choose the 667 Area Code

A local 667 area code number signals genuine Maryland presence to customers across Baltimore's healthcare, government, financial, and logistics sectors — industries where a recognized local prefix often determines whether a call gets returned.

Remote businesses entering this market can maintain a Baltimore-area identity without leasing Maryland office space or hiring local staff. Johns Hopkins, the University of Maryland Medical System, and MedStar Health anchor one of the highest concentrations of medical research institutions in the eastern US — making healthcare vendors, staffing firms, and pharma contractors among the most active users of 667 local numbers. Seasonal peaks tied to the Preakness Stakes, Orioles and Ravens home schedules, and port commerce cycles create predictable outreach windows where a local number drives stronger response rates.

Is a 667 Area Code Call a Scam?

The 667 area code is a legitimate geographic overlay for central and eastern Maryland and carries no inherent connection to fraud. Scammers do spoof Mid-Atlantic codes to increase answer rates — targeting a prefix associated with Baltimore's recognizable institutions improves their odds with unsuspecting recipients.

Common patterns include fake utility company calls, Social Security impersonation, and local business fraud using spoofed numbers. If you receive an unsolicited call from a 667 area code number requesting immediate payment or sensitive personal details, end the call and verify through the organization's official published contact before responding.

Neighboring Area Codes

Knowing the codes surrounding 667 helps you recognize calls from nearby regions and plan cross-market outreach effectively.

Conclusion

The 667 area code defines Baltimore and central Maryland's telephone identity — a third-generation overlay built from more than three decades of continuous growth that drove Maryland from a single statewide code through two splits and two successive overlays. Its territory spans one of the eastern US's most economically layered regions: a world-class port, major university medical systems, a state capital, and one of America's most historically resonant cities, all sharing a single local code family. For any business seeking to connect with Baltimore's healthcare sector, Annapolis's government market, or Columbia's corporate corridor, a local 667 area code number is the fastest signal of genuine regional membership. Understanding this code's overlay structure, Eastern Time zone, and the communities it serves puts you fully in control of every 667 interaction.

Activating a virtual 667 number takes minutes and removes every traditional barrier — no Maryland residency, no hardware, and no carrier commitment. Call forwarding, two-way SMS, and voicemail make a virtual line fully functional on any device from anywhere in the world. Whether your outreach targets Johns Hopkins's procurement network, the Port of Baltimore's logistics sector, or a state agency in Annapolis, a local 667 prefix puts your calls in the trusted tier. Make that move today and have your Maryland number live before your next campaign begins.