301 area code
Washington area, Eastern Time.Area code 301 covers Washington, Frederick, Gaithersburg and 46 more places in Maryland, on Eastern Time. 227 and 240 cover the same area.
Right now in Frederick
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer)
Calling hours: Every day, 8 AM to 8 PM (Maryland law)
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Where 301 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 301 has 49. Each one's share is how many 301 numbers start there. Its biggest metro area is Washington-Arlington-Alexandria, DC-VA-MD-WV.
- Washington65%
- Frederick5%
- Gaithersburg4%
- Waldorf3%
- Laurel3%
- Hagerstown3%
Also: Cumberland, Lexington Park Great Mills, Ashton 236, Myersville, Leonardtown, Oakland, Damascus, Indian Head, Laurel, Brandywine, Damascus, La Plata + 31 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 301 number?
Sales calls to homes and cell phones have legal hours, set by Maryland law. Hold every 301 number to them, since you can't tell a work line from a personal cell.
What applies to 301Every day, 8 AM to 8 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
- Maryland lawEvery day, 8 AM to 8 PMAlso no more than 3 calls in 24 hours on the same subject.Md. Code, Com. Law 14-4502(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
301 and 227 and 240
301 is one of the original area codes from 1947, and 410 was later split off from it. 301, 227 and 240 cover the same area, so new numbers can get any of them and neighbors can have different area codes. 301 holds 46% of the area's exchanges, about as many as 240. Local calls take all 10 digits.
- 1947301 starts
- 1991410 split off
- 1997240 overlay
- 2023227 overlay
Source: NANPA area code database
Other Maryland area codes
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301 area code FAQ
What area code is 301?
301 is a Maryland area code for Washington, Frederick, Gaithersburg, Waldorf and 45 more places.
What time zone is the 301 area code in?
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer).
Is 227 the same as 301?
Same area, different code. 301, 227 and 240 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 301 numbers?
Every day, 8 AM to 8 PM, local time, under Maryland law.
When did the 301 area code start?
In 1947: it's one of the original area codes.
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