Maryland area codes
- Area codes in
- 5
- State
- Maryland
- 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 8 October 2026
Now in Maryland
Eastern Time · UTC−5, UTC−4 in summer
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Eastern Time
Typical business hours, 9 to 5 Monday to Friday.
Typical business hours, 9 to 5 Monday to Friday, shown as the blue arc. A guide to when a real Maryland office is likely to answer. It says nothing about who called you.
01
All area codes in Maryland
02
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.
03
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.
04
Spam call reports in Maryland
These Maryland area codes drew the most reports to the FTC in the 30 days to 8 October 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 (30 days) |
|---|---|---|---|
| 1 | 443 | Baltimore | 551 |
| 2 | 240 | Germantown | 485 |
| 3 | 410 | Baltimore | 406 |
| 4 | 301 | Silver Spring | 393 |
| 5 | 667 | Baltimore | 236 |
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 8 October 2026. Request a correction. Month-over-month figures appear once two complete 30-day windows exist.
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05
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, wherever an overlay operates. 3 of Maryland’s area codes are overlays, and local calls within an overlay area require the full ten-digit number.
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 8 October 2026, with 551 numbers reported.
Neighbouring states
Largest cities