Maryland Calling
Codes 410 & 301
Calling Baltimore, Annapolis, or the DC suburbs? Maryland uses multiple area codes including 410, 301, 240, and 443. Connect instantly to any Maryland number from your browser.
How to Call Maryland Step-by-Step
Maryland has multiple overlay codes, so knowing the correct area code is crucial.
Exit Code
Dial your country's exit code (e.g., 00 for Europe, 011 for Asia). Skip if in US/Canada.
Country Code (+1)
Dial +1 for the United States.
Area Code
Dial the 3-digit area code (410, 301, 240, etc.) followed by the 7-digit number.
10-Digit Dialing is Mandatory
Because Maryland has multiple area codes covering the same geographic regions (overlays), you must always dial the full 10 digits (Area Code + Number), even for local calls.
Maryland City Codes
Common area codes for major Maryland cities.
| City | Region | Area Code |
|---|---|---|
| Baltimore | Central | 410 / 443 |
| Annapolis | Anne Arundel | 410 / 443 |
| Silver Spring | Montgomery | 301 / 240 |
| Rockville | Montgomery | 301 / 240 |
| Frederick | Western MD | 301 / 240 |
| City | Region | Area Code |
|---|---|---|
| Ocean City | Eastern Shore | 410 / 443 |
| Gaithersburg | Montgomery | 301 / 240 |
| Bowie | Prince George's | 301 / 240 |
| Hagerstown | Washington | 301 / 240 |
| Columbia | Howard | 410 / 443 |
Connect to Maryland Business
Instantly
From the biotech corridors of Montgomery County to the bustling port of Baltimore, Maryland is a hub of industry. StartACall gives you a professional connection to the state without the high cost of traditional carriers.
- Reach 410, 301, 240, 443, and 667 numbers
- Crystal clear HD voice quality
- No app download required - use your browser
- Pay-as-you-go pricing model
Save Money
Fraction of the cost of carrier roaming rates.
Any Device
Call from your laptop, tablet, or phone.
Secure
Enterprise-grade encryption for all calls.
Reliable
99.9% uptime for critical communications.
Frequently Asked Questions
What is the difference between 301 and 240?
They are overlay codes covering the same region (Western Maryland, including DC suburbs). 301 is the original code, and 240 was added later. Both work for the same cities.
What is the difference between 410 and 443?
Similar to 301/240, 410 and 443 (and the newer 667) are overlay codes for Eastern Maryland, including Baltimore and Annapolis.
How do I call a Maryland number from the UK?
Dial 00 (UK exit code) + 1 (US country code) + Area Code (e.g., 410) + 7-digit number.
Can I call Maryland cell phones?
Yes, you can call any mobile or landline number in Maryland. US mobile numbers look exactly like landline numbers and use the same area codes.
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