410 area code
Baltimore area, Eastern Time.Area code 410 covers Baltimore, Towson, Annapolis and 99 more places in Maryland, on Eastern Time. 443 and 667 cover the same area.
Right now in Baltimore
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 410 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 410 has 102. Each one's share is how many 410 numbers start there. Its biggest metro area is Baltimore-Columbia-Towson, MD.
- Baltimore24%
- Towson7%
- Annapolis5%
- Catonsville4%
- Glen Burnie4%
- Salisbury3%
- Waterloo 2363%
- Columbia3%
- Elkridge3%
- Pikesville2%
- Severna Park2%
- Cockeysville2%
Also: Ellicott City, Fork, Parkville, Easton, Woodlawn, Bel Air, Essex, Arbutus, Severn, Westminster, Edgewood, Elkton + 78 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 410 number?
Sales calls to homes and cell phones have legal hours, set by Maryland law. Hold every 410 number to them, since you can't tell a work line from a personal cell.
What applies to 410Every 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
410 and 443 and 667
410 went into service on October 6, 1991, split off from 301. 410, 443 and 667 cover the same area, so new numbers can get any of them and neighbors can have different area codes. 410 holds 39% of the area's exchanges, about as many as 443. Local calls take all 10 digits.
- 1991410 starts
- 1997443 overlay
- 2012667 overlay
Source: NANPA area code database
Other Maryland area codes
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410 area code FAQ
What area code is 410?
410 is a Maryland area code for Baltimore, Towson, Annapolis, Catonsville and 98 more places.
What time zone is the 410 area code in?
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer).
Is 443 the same as 410?
Same area, different code. 410, 443 and 667 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 410 numbers?
Every day, 8 AM to 8 PM, local time, under Maryland law.
When did the 410 area code start?
On October 6, 1991. It was split from 301.
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