Maryland Calling
Codes 410 & 301
Need to reach Baltimore, Annapolis, or the DC suburbs? Maryland spreads across several area codes, among them 410, 301, 240, and 443. Dial any Maryland number straight from your browser and pay only low per minute rates.
Dialing Maryland, One Step at a Time
With several overlay codes in play, picking the right area code makes all the difference.
Exit Code
Enter the exit code for your country, such as 00 in Europe or 011 in Asia. You can skip this from the US or Canada.
Country Code (+1)
Punch in +1 for the United States.
Area Code
Add the 3-digit area code, like 410, 301, or 240, and then the 7-digit number.
Always Dial All 10 Digits
Since Maryland layers several area codes over the same regions through overlays, every call needs the complete 10 digits (Area Code + Number), even when it is a local one.
Area Codes by Maryland City
The area codes you will dial across Maryland's biggest 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 |
Reach Maryland Business
for Less
From the biotech corridors of Montgomery County to the busy port of Baltimore, industry runs deep in Maryland. Intercalling links you to the state with a professional line and per minute rates that undercut what traditional carriers charge.
- Dial 410, 301, 240, 443, and 667 numbers
- HD voice that stays crystal clear
- No app to download, just open your browser
- Pay as you go pricing with no contracts
Save Money
A small fraction of what carrier roaming would cost.
Any Device
Dial from a laptop, tablet, or phone.
Secure
Every call carries enterprise grade encryption.
Reliable
99.9% uptime keeps critical calls connected.
Frequently Asked Questions
How do 301 and 240 differ?
Both are overlay codes for the same territory, Western Maryland and the DC suburbs. The 301 code came first and 240 arrived afterward, yet either one reaches the same cities.
How do 410 and 443 differ?
Much like 301 and 240, the 410 and 443 codes, along with the newer 667, are overlays for Eastern Maryland, Baltimore and Annapolis included.
How can I reach a Maryland number from the UK?
Start with 00, the UK exit code, then 1 for the US country code, then the area code such as 410, and finish with the 7-digit number.
Can I dial Maryland mobile phones?
Yes. Any mobile or landline in Maryland is reachable, and US mobile numbers share the exact format and area codes as landlines.
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