Maryland area codes
- Area codes in
- 5
- State
- Maryland
- Local time
- Eastern Time
Maryland is served by 5 area codes, from 301 in 1947 to 667 in 2012. 3 of them are overlays, added as older codes filled up.
Updated 28 July 2026
All area codes in Maryland
Maryland is served by 5 area codes. 301 is the oldest, in service since 1947; 667 is the newest, activated in 2012.
Maryland area code map
Maryland sits in the Eastern Time zone, with its 5 codes spread across the state.
Maryland area codes by city
These are the Maryland cities served by more than one area code, or whose code also covers a wider area.
Germantown
Silver Spring
Overlay codes and dialling rules in Maryland
3 of Maryland’s 5 area codes are overlays — a second code laid over an existing footprint instead of splitting it. Wherever an overlay operates, local calls require the full ten-digit number.
Spam call reports in Maryland
These Maryland area codes drew the most reports to the FTC in the 30 days to 28 July 2026. The figures describe numbers displaying each code, which caller ID spoofing can fake.
Most reported Maryland area codes · last 30 days
| Code | Primary city | Reports |
|---|---|---|
| 443 | Baltimore | 572 |
| 301 | Silver Spring | 563 |
| 410 | Baltimore | 520 |
| 240 | Germantown | 415 |
| 667 | Baltimore | 313 |
A number listed here may itself be a spoofing victim rather than the caller. These are unverified consumer reports.
Source: FTC Do Not Call Reported Calls Data, unverified consumer reports, retrieved 28 July 2026. Request a correction.
Calls from your Maryland numbers not landing?
Questions
How many area codes does Maryland have?
Maryland has 5 area codes: 240, 301, 410, 443, 667.
What is the main area code for Baltimore?
The main area code for Baltimore is 410.
Which Maryland area code is oldest?
Area code 301 is the oldest in Maryland, in service since 1947.
Do I need to dial ten digits in Maryland?
Yes, anywhere an overlay operates. 3 of Maryland’s codes are overlays, and ten-digit dialling is required for local calls in those areas.
Which Maryland area code gets the most spam calls?
Area code 443 (Baltimore) drew the most reports of any Maryland code in the 30 days to 28 July 2026, with 572 numbers reported.
Neighbouring states