Maryland area codes: full list with cities and how to dial
Maryland has roughly 6.2 million residents, and its phone numbers are organized into 6 area codes under the North American Numbering Plan. Maryland is served by 6 active geographic area codes, anchored by 410 in the Baltimore area. Maryland uses two statewide overlay complexes, each with three codes. Every Maryland number is dialed as +1, then the three-digit area code, then a seven-digit local number. With Phonecall you can call any Maryland landline or mobile straight from your browser. There is no app to install, no SIM, and no subscription. You see the per-minute rate before you dial, billing is by the second, and your first call is free.
Call Maryland from your browserAll Maryland area codes
6 active geographic area codes in service across Maryland.
| Area code | Primary cities and region | Example number |
|---|---|---|
| 410 | Baltimore metro and Eastern Shore (overlay of 410/443/667) | +1 (410) 555-0100 |
| 443 | Baltimore metro and Eastern Shore (overlay) | +1 (443) 555-0100 |
| 667 | Baltimore metro and Eastern Shore (overlay) | +1 (667) 555-0100 |
| 301 | Western Maryland and DC suburbs incl. Montgomery and Prince George's (overlay of 301/240/227) | +1 (301) 555-0100 |
| 240 | Western Maryland and DC suburbs (overlay of 301) | +1 (240) 555-0100 |
| 227 | Western Maryland and DC suburbs (overlay) | +1 (227) 555-0100 |
Example numbers use the reserved 555-0100 range and are for illustration only.
How to call Maryland from abroad
Every Maryland phone number is part of the +1 North American calling zone. To reach one from outside the United States, dial three parts in order:
- 1. Your exit code, then +1 — the US country code.
- 2. The three-digit area code — for example 410 for the Baltimore area.
- 3. The seven-digit local number.
Example, full international format:
+1 (410) 555-0100
With Phonecall you skip the exit codes entirely. Enter the number in international format and we connect the call from your browser, billed by the second from $0.03/min, with no SIM, no app, and no monthly fee.
Why Maryland has multiple area codes
Maryland uses two statewide overlay complexes, each with three codes.
When a region runs low on available numbers, the phone system adds capacity in one of two ways. A split divides the old region geographically and gives part of it a brand-new area code. An overlay keeps the existing code and layers a second one on top of the same area, which is why a single city can have several area codes and why ten-digit dialing becomes the norm. Either way, the number you dial always stays the same length: +1, the area code, then seven digits.
6
active area codes
~6.2 million
residents (approx.)
Baltimore
largest city
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Maryland area codes: frequently asked questions
What is the main area code for Baltimore?
Baltimore, the largest city in Maryland, is primarily served by area code 410 (Baltimore metro and Eastern Shore (overlay of 410/443/667)). Maryland has 6 area codes in total, listed in full above.
How do I dial a Maryland number from another country?
Dial your international exit code, then +1 (the US country code), then the three-digit Maryland area code, then the seven-digit local number. With Phonecall you just enter the number in international format and we connect the call from your browser, from $0.03/min.
How many area codes does Maryland have?
Maryland currently has 6 active geographic area codes in service. Maryland uses two statewide overlay complexes, each with three codes.