Maryland · Eastern Time
410 Area Code
Area code 410 is in Maryland, serving Baltimore metro and the rest of eastern Maryland, including the Eastern Shore. It is in the Eastern Time zone. It shares its territory with overlay codes 443 and 667, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 410 area code?
410 is a Maryland area code covering Baltimore metro and the rest of eastern Maryland, including the Eastern Shore. In the wider directory it sits in the South region.
Cities in the 410 area code
- Baltimore
- Columbia
- Glen Burnie
- Towson
- Ellicott City
- Dundalk
- Annapolis
- Salisbury
- Westminster
- Bel Air
- Aberdeen
- Elkton
- Easton
- Ocean City
Counties served by 410
Baltimore County, Anne Arundel County, Howard County, Harford County, Carroll County, Cecil County, Wicomico County, Talbot County, Worcester County and Calvert County.
410 overlay codes and dialing
The 410 territory is covered by an overlay of 3 area codes: 410, 443, 667. All of them serve the same geographic area, and the original code is 410. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 410 area code
410 went into service on October 6, 1991, created when it was split from 301. It serves Baltimore and the surrounding part of Maryland, and today shares its territory with overlay codes 443 and 667. For how codes are created, split, and overlaid, see how area codes work.
Is 410 a scam or spam risk?
410 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 410 number on your screen is no guarantee the caller is in Baltimore, MD or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Explore more
See every code in Maryland, compare codes across the South region, or view all Eastern Time codes. You can also browse the 4XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
410 area code FAQ
Where is the 410 area code?
The 410 area code is in Maryland, covering Baltimore metro and the rest of eastern Maryland, including the Eastern Shore, in the South region.
What cities are in the 410 area code?
Cities in the 410 area code include Baltimore, Columbia, Glen Burnie, Towson, Ellicott City, Dundalk, Annapolis, Salisbury, Westminster and Bel Air.
What time zone is 410 in?
410 is in the Eastern Time zone.
What is the overlay for the 410 area code?
410 shares its territory with 443 and 667. All 3 codes (410, 443, 667) serve the same area, so 10-digit dialing is required for every call.
When did the 410 area code start?
410 went into service on October 6, 1991.
Do I have to dial 10 digits for 410?
Yes. Because 410 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 410 a toll-free or premium code?
No. 410 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.