Which Area Codes Cover Maryland?

MD currently uses various area codes that cover cities, towns, and rural regions across the state. These include:

• 301 – Covers western Maryland including Frederick and Hagerstown
• 240 – Overlay of 301, used in the same regions
• 410 – Serves Baltimore, Annapolis, and the eastern shore
• 443 – Overlay for 410, including Baltimore and surrounding areas
• 667 – Additional overlay for Baltimore region

You can find more about these codes on the NANPA official site or via the FCC Area Code Information page.

Timeline of Area Code Changes in Maryland

Maryland’s original area code was 301, established in the late 1940s as part of the original North American Numbering Plan. As the state grew and landlines and cellular devices increased, overlays were introduced. Wikipedia’s Maryland area code page offers a detailed breakdown.

1. 1947: Area code 301 established
2. 1991: Area code 410 created due to demand
3. 1997: 240 added as overlay for 301
4. 1997: 443 overlays 410
5. 2012: 667 introduced as additional overlay

These changes were required due to increased demand for phone numbers across Maryland's growing cities and tech hubs. Learn more via the FCC website.

Maryland Cities by Phone Code

Here’s a list of prominent Maryland cities and the area codes they use:

Need to identify a suspicious number from Maryland? Use services like Whitepages or Nomorobo for lookup and spam detection.

The Reason Behind Maryland’s Overlays

Due to the high population density in cities like Baltimore and the adoption of smartphones, VoIP lines, and other devices, Maryland’s phone number demand exploded. This led to the introduction of multiple overlay codes.

The North American Numbering Plan Administration (NANPA) regulates these additions and ensures proper phone routing across the state.

How to Get a Maryland Business Phone Number

Getting a local number in Maryland can help businesses increase conversions. If you're launching a business in Baltimore or Annapolis, a number with a 410 or 443 area code can make all the difference.

With platforms like Bling’s virtual number service, you can choose any Maryland code and receive calls anywhere in the world. It’s perfect for call routing, AI assistants, and advanced VoIP setups.

Watch a quick explainer on how Maryland area codes work for business in this YouTube video.

How to Lookup a Maryland Area Code?

Use reverse lookup tools like TrueCaller or Whitepages to search by phone number. These platforms help you determine the location, copyright, and whether the number is a scam or robocall.

Business Phone System Options in Maryland

{Setting up a business phone service in Maryland is easier than ever. Learn about robust, AI-powered VoIP tools at Bling’s Business Phone System page.

Using Maryland Area Codes with VoIP

Voice over Internet Protocol (VoIP) is modernizing how businesses and individuals communicate. Instead of relying on landlines, VoIP lets you make calls over the internet — and still use local Maryland area codes like 301 or 410.

If you want to use area code 240 or 443 for your business but operate from outside Maryland, VoIP makes it simple. Check out this page on VoIP phone services to learn how you can get started instantly.

According to FCC VoIP Guidelines, VoIP offers the same benefits as traditional phone systems, with far more flexibility and integration possibilities.

Overlay Codes Explained in Maryland

In Maryland, overlay area codes were introduced when the available number combinations in an area code were exhausted. This means a new code was added to the same geographical region.

• 240 overlays 301
• 443 and 667 overlay 410

This overlay system ensures users keep their existing numbers, but new numbers receive the newer overlay. It’s now common to require 10-digit dialing in Maryland due to these overlays. Learn more at FCC.gov.

How to Buy a Maryland Local Number Online

You can now purchase a virtual phone number with a Maryland area code in minutes. Services like Bling offer 301, 410, 240, and other codes to support business and personal use.

A virtual number lets you receive calls on any device, route through an AI assistant, and integrate CRM or ticketing tools. This is ideal for businesses in Annapolis wanting a local presence.

For example, if your marketing team is based in NYC but targets Maryland leads, a local 443 or 410 number will support regional targeting.

Top Cities Using Each Maryland Area Code

Here’s a quick breakdown of which Maryland cities and counties use each area code:

If you want to research specific city-based numbers or history of area codes, consult this Wikipedia resource or browse TrueCaller for real-time phone identity tracking.

Boosting Brand Trust With Local Numbers

Incorporating a local number like 301 or 410 into your business phone system enhances credibility and improves customer response rates.

Whether you’re in SaaS, real estate, healthcare, or retail, customers tend to answer calls from area codes they recognize. You can secure your Maryland business phone number here to create local authority.

Businesses also benefit from features like IVR, call recording, SMS automation, and AI agents — all made possible by modern communication platforms.

Find Information About Any Maryland Phone Number

Have a missed call from 667 or 240? Don’t worry. Lookup tools like Whitepages, TrueCaller, and Nomorobo help you trace numbers back to their source.

These platforms can identify robocalls, spam, telemarketers, or legit local businesses. You can also submit reports and protect your number from being spoofed.

How to Avoid Maryland Phone Scams

Unfortunately, scammers can spoof local Maryland area codes to make calls appear trustworthy. You might receive a call from 301 or 410 that mimics your location.

Always verify with a tool like Nomorobo or TrueCaller. If you’re a business, use secure routing and number monitoring tools to flag misuse.

Want to automate your response or deflect robocalls with AI? Bling’s business phone platform offers advanced call management features.

Final Thoughts on Maryland Area Codes

Maryland’s telephone system is a classic case of how urban expansion influences phone number availability. From the original 301 code to overlays like 443 and 667, these codes support both personal and business communication.

Running a business in Maryland and want to enhance your local presence, a local phone number is essential. Platforms like Bling help you secure a virtual Maryland business number with call routing, VoIP, SMS, and AI integration.

Select 301, 240, 410, 443, or 667 depending on your preferred region or client base. Whether you’re in Silver Spring, Annapolis, Baltimore, or remote, you can build local trust with a professional phone setup.

FAQs About Maryland Area Codes

Get a Maryland Phone Number Now

Whether you’re launching a startup or expanding to a new market, a Maryland area code helps improve call pickup rates.

With Bling’s business phone system, you can get started with a AI-powered phone line with any Maryland area code you choose.

From customer support to outbound sales, your team can handle everything from one powerful dashboard — using local numbers that resonate with Maryland customers.