Area Code for Baltimore, MD

Baltimore’s metro area uses three area codes — 410, 443, and 667 — all covering the same Eastern Maryland geography. Whether you are calling Johns Hopkins, the Inner Harbor, or a Canton restaurant, you are dialing one of these three prefixes.

This guide covers the full history of each code, the Baltimore neighborhoods and cities they serve, scams to watch for, and how businesses can get a local Baltimore number with verified caller ID.

What’s the area code for Baltimore?

All three codes are active simultaneously. No code is “better” or covers a different part of the city — they are overlays, meaning they stack on top of each other.

Code	Established	Type	Coverage
410	October 6, 1991	Split from 301	Baltimore city, Eastern MD, Eastern Shore
443	July 1, 1997	Overlay on 410	Same as 410
667	March 24, 2012	Overlay on 410/443	Same as 410/443

Ten-digit dialing (area code + 7-digit number) is required for all local calls within the 410/443/667 region. You cannot skip the area code even for a neighbor across the street.

Baltimore metro area codes by neighborhood

Every Baltimore neighborhood falls within the 410/443/667 overlay. Here is how the codes map across the city’s most recognizable areas:

Inner Harbor — The waterfront tourist and commercial core. Hotels, the National Aquarium, and convention facilities all use 410, 443, or 667 numbers.

Fells Point — Historic cobblestoned waterfront district, bars, and boutiques. One of Baltimore’s oldest neighborhoods.

Federal Hill — South Baltimore hilltop with views of the harbor. Dense residential and restaurant district.

Mount Vernon — Cultural center with the Washington Monument, Walters Art Museum, and historic rowhouses. High concentration of arts organizations.

Hampden — North-central Baltimore; independent shops, “The Avenue” (36th Street), and the Hon Festival. Strong local business character.

Canton — Southeast Baltimore waterfront; popular with young professionals, restaurants, and the Canton Crossing retail development.

Towson — Baltimore County seat, just north of city limits. Towson University, major shopping, and suburban office parks — all 410.

Annapolis — Maryland’s state capital, 30 miles south. Anne Arundel County is fully within the 410/443/667 overlay despite being a separate city from Baltimore.

Eastern Shore — Nine counties (Caroline, Cecil, Dorchester, Kent, Queen Anne’s, Somerset, Talbot, Wicomico, Worcester) spanning the Chesapeake Bay’s eastern bank. All carry 410/443/667.

History of Baltimore area codes

Understanding why Baltimore has three codes requires going back to the beginning of North American telephone numbering.

1947 — 301 established. AT&T’s original North American Numbering Plan assigned a single area code, 301, to all of Maryland (and, briefly, part of Virginia). For four decades, 301 handled every telephone in the state. Source: NANPA.

1991 — 410 split. By the late 1980s, the Washington, DC suburbs in Montgomery and Prince George’s counties were consuming central office prefixes rapidly. Fax machines, pagers, and population growth in suburban Maryland pushed 301 toward exhaustion. The solution was a geographic split: western and southern Maryland (including the DC suburbs) kept 301, while Eastern Maryland — including Baltimore city, the Baltimore metro, and the Eastern Shore — received the new area code 410. The split took effect October 6, 1991.

1997 — 443 overlay. Within six years, the cell phone revolution had driven 410 toward its own exhaustion. The Maryland Public Service Commission approved an overlay rather than another geographic split. An overlay adds a new code on top of the existing geography rather than forcing millions of customers to change numbers. Area code 443 went live July 1, 1997, assigning all new 10-digit numbers in Eastern Maryland. Mandatory 10-digit dialing for all local calls was already in effect.

2012 — 667 overlay. The smartphone era replicated the pattern. By 2011, the combined 410/443 pool was again running short. A third overlay, 667, was implemented on March 24, 2012. NANPA records show the overlay assigned “24 million numbers to just over four million people,” providing substantial runway for future growth. Maryland PSC approved the overlay to again spare residents a forced number change.

410 as Baltimore identity

Area code 410 carries cultural weight that 443 and 667, as younger overlay codes, have not yet accumulated. If you want to signal that your business is rooted in Baltimore, 410 is the number people recognize.

Johns Hopkins. The Johns Hopkins University and Johns Hopkins Medicine are among the largest employers in Maryland. Hopkins’ main campus (Homewood), the Bloomberg School of Public Health, and the Johns Hopkins Hospital all sit in Baltimore proper with 410 numbers. For healthcare vendors, research suppliers, and professional services firms, a 410 number signals presence in one of the world’s leading medical research corridors.

Under Armour. Founded in Baltimore in 1996 by Kevin Plank, Under Armour’s global headquarters is at Port Covington on the Baltimore waterfront. The company’s rise from a garage startup to a $5B sportswear brand is one of Baltimore’s defining modern business stories — and its main switchboard runs on 410.

Ravens and Orioles. M&T Bank Stadium (Ravens) and Oriole Park at Camden Yards sit within walking distance of downtown. Both venues use 410 numbers for ticket offices and operations. Camden Yards, opened 1992, is widely credited with sparking the retro ballpark movement across MLB.

Port heritage. The Port of Baltimore is one of the largest on the US East Coast and the largest for roll-on/roll-off cargo. Shipping, logistics, and marine services firms operating from the port have used 410 since 1991.

Literary and cultural legacy. Edgar Allan Poe spent formative years in Baltimore and is buried at Westminster Hall. The city later inspired HBO’s The Wire (2002–2008), which depicted Baltimore’s neighborhoods and institutions in a way that shaped national perceptions of the city. Both the Poe House and the Wire locations are 410 exchanges.

Baltimore area code spam and scams

Baltimore’s three area codes are spoofed by scammers who know that local-looking numbers get answered. Maryland-specific fraud patterns to know:

BGE impersonation. Baltimore Gas and Electric scams are among the most reported in Maryland. Callers claim your service will be shut off within hours unless you pay immediately by gift card or wire transfer. BGE will never call to demand immediate payment or request your account number over the phone. Report to bge.com/scams.

IRS and government impersonation. Callers claiming to be IRS agents or Social Security Administration officers, threatening arrest for unpaid taxes. The IRS initiates contact by mail, not phone calls.

Fake Hopkins recruitment. Scammers target job seekers with fake Johns Hopkins research assistant or administrative positions. Legitimate Hopkins HR contacts come from @jhu.edu email addresses, not unsolicited 410 calls asking for Social Security numbers.

Port and shipping fraud. Businesses near the Port of Baltimore receive calls about fake cargo holds, customs fees, or shipping insurance. Verify all port-related calls through official Port of Baltimore contacts.

STIR/SHAKEN protection. The FCC’s STIR/SHAKEN framework assigns attestation levels to outbound calls. Calls originating from verified business lines with A-attestation are authenticated end-to-end — carriers flag unverified callers before they reach recipients. For more, see our STIR/SHAKEN glossary entry.

If you receive a suspicious call from a 410, 443, or 667 number, do not provide personal information. Hang up and call the organization directly using their official number.

How to get a Baltimore business phone number

A local 410, 443, or 667 number establishes presence in the Baltimore market without requiring a physical office. VoIP provisioning means you can activate a Baltimore number in minutes and route it to any device.

Step 1 — Choose your area code. All three Baltimore codes carry equal weight functionally. If brand recognition matters, 410 is the code most associated with Baltimore identity. If availability is the priority, 667 has the most unassigned numbers remaining.

Step 2 — Select a plan. DialPhone’s business phone plans include local number provisioning. The free trial lets you test a Baltimore number before committing.

Step 3 — Configure your number. Route your Baltimore number to your existing mobile, a softphone app, or an auto-attendant. DialPhone’s AI receptionist can answer Baltimore calls 24/7 and route to the right team member.

Step 4 — Port your existing number. Already have a Baltimore number from another carrier? Number porting transfers it to DialPhone without changing the digits. See the number porting guide for timelines and requirements.

Step 5 — Verify STIR/SHAKEN attestation. DialPhone provisions 410, 443, and 667 numbers with A-attestation by default. This means your Baltimore calls reach recipients as verified, not flagged as potential spam — critical for healthcare, financial services, and research outreach in the Baltimore market.

For the full business phone setup guide, see our product pages.

Famous companies with Baltimore area code numbers

Baltimore’s economy spans healthcare, financial services, defense, and consumer brands — all operating on 410/443/667.

Johns Hopkins Health System — One of the most recognized medical institutions globally. Main campus and all Baltimore clinical facilities: 410.

T. Rowe Price — Baltimore-headquartered asset management firm managing over $1.4 trillion. A major employer in the city’s financial sector: 410.

McCormick & Company — The world’s largest spice and flavor company, headquartered in Hunt Valley (Baltimore County): 410.

Under Armour — Global sportswear brand, Port Covington HQ: 410. Under Armour is one of the most prominent Fortune 500 companies to grow from Baltimore roots.

Constellation Energy — Major utility and power generation company, Baltimore HQ: 410.

MedStar Health — One of the largest not-for-profit healthcare systems in the mid-Atlantic, headquartered in Columbia (Howard County): 410.

Pandora Jewelry North America — North American headquarters located in Baltimore: 410.

W. R. Grace — Specialty chemicals and materials company, Columbia HQ: 410.

These anchor employers make 410/443/667 numbers a trust signal in healthcare, financial, and enterprise procurement contexts — a local number signals genuine local presence.

Baltimore area code FAQ

Baltimore area code FAQ

What is the area code for Baltimore, MD? +

Baltimore uses three area codes: 410, 443, and 667. All three serve the same geographic region — Baltimore city, Baltimore County, and most of Eastern Maryland.

Area code 410 was the first, introduced in 1991 when the original Maryland code 301 was split. Area code 443 was added as an overlay in 1997, and 667 followed as a second overlay in 2012. When you dial a Baltimore number, any of the three prefixes tells you the call is going to the same metro area.

What is the difference between 410, 443, and 667? +

There is no functional geographic difference — all three codes cover identical territory in Eastern Maryland including Baltimore city.

The distinction is age and assignment. Area code 410 is the oldest (1991) and carries most landline numbers. Area code 443 was added in 1997 for new numbers once 410 ran low, and 667 was added in 2012 for the same reason. Cell phones and VoIP lines issued after each overlay date are more likely to carry 443 or 667 prefixes.

Does Annapolis use the 410 area code? +

Yes. Annapolis, the Maryland state capital, falls within the 410/443/667 overlay region. It is not in the Baltimore city limits but sits in Anne Arundel County, which is fully covered by the Eastern Maryland overlay group.

If you are calling a government office, restaurant, or business in Annapolis, you will be dialing a 410, 443, or 667 number.

Why does Baltimore have three area codes? +

Each code was added when the previous one ran out of assignable number combinations.

Area code 301 served all of Maryland until 1991, when explosive demand from fax machines, pagers, and suburban growth forced a split that created 410 for Eastern MD. Cell phone adoption drove 410 to exhaustion by 1997, prompting the 443 overlay. The smartphone era did the same to 410/443 by 2011, leading to 667 in 2012. Overlays are preferred over geographic splits because no existing customer has to change their number.

Is 410 a scam area code? +

No — 410, 443, and 667 are legitimate Baltimore metro area codes. However, scammers do spoof these area codes to appear local and increase answer rates.

Common Baltimore-specific scams include fake BGE (Baltimore Gas & Electric) utility shutoff calls, IRS impersonation, and fake Johns Hopkins recruitment calls. BGE will never call to request your account number or payment card over the phone. If you receive a suspicious call from a 410, 443, or 667 number, verify by calling BGE or the agency directly using their official number.

Can I get a Baltimore 410 area code number for my business? +

Yes. VoIP providers including DialPhone can provision new 410, 443, or 667 numbers instantly. You do not need a physical Baltimore office — a virtual Baltimore number lets any business establish a local presence in the market.

Numbers provisioned through DialPhone carry STIR/SHAKEN A-attestation, which means carriers verify your calls as legitimate and they are less likely to be flagged as spam. See our pricing page for plans.

What cities are in the 410 area code besides Baltimore? +

The 410/443/667 overlay covers a large portion of Eastern Maryland beyond Baltimore city itself. Major cities and towns include: Columbia, Towson, Annapolis, Glen Burnie, Ellicott City, Dundalk, Catonsville, Bowie, and Salisbury.

The Eastern Shore counties — Caroline, Cecil, Dorchester, Kent, Queen Anne's, Somerset, Talbot, Wicomico, and Worcester — also fall within the 410/443/667 footprint.

What is STIR/SHAKEN and does it apply to Baltimore numbers? +

STIR/SHAKEN is a FCC-mandated caller ID authentication framework that assigns an attestation level (A, B, or C) to outbound calls.

A-attestation means the carrier has verified that the calling party is authorized to use that number — the gold standard for call trust. DialPhone provisions 410, 443, and 667 numbers with A-attestation, which matters especially in Baltimore's healthcare and research sectors where unanswered calls represent real operational cost.

Get a Baltimore business number

A verified 410, 443, or 667 number positions your business inside one of the East Coast’s most active healthcare, research, and logistics markets.

Start a free trial — activate a Baltimore number in minutes, no hardware required.

View business phone plans — includes AI receptionist, call routing, and STIR/SHAKEN A-attestation for all Baltimore area codes.

Already have a Baltimore number with another carrier? The number porting guide walks through the full transfer process. For area code context across Maryland, see Maryland area codes and the individual pages for 410, 443, and 667.