The 410 area code serves eastern Maryland, including the city of Baltimore, the state capital of Annapolis, and the entire Eastern Shore. Created in 1991 when it split from 301, 410 covers the state’s largest metropolitan area along with the Chesapeake Bay communities and the Atlantic resort of Ocean City.
Quick Summary of the 410 Area Code
| Area Code | 410 |
| State | Maryland (MD) |
| Region | Baltimore, Annapolis & the Eastern Shore |
| Major Cities | Baltimore, Annapolis, Columbia, Towson, Dundalk, Ellicott City, Glen Burnie, Salisbury, Ocean City |
| Time Zone | Eastern Time (ET) – EST / EDT |
| Dialing Format | 10-digit dialing required |
Geographic Coverage
The 410 area code covers the eastern half of Maryland, from the city of Baltimore and its suburbs of Towson, Dundalk, and Glen Burnie, west to Columbia and Ellicott City in Howard County, south to the state capital of Annapolis on the Chesapeake Bay, and across the Bay Bridge to the entire Eastern Shore, including Salisbury and the beach resort of Ocean City. It shares its footprint with the 443 and 667 overlays.
Time Zone
The 410 area code observes Eastern Time (ET). Clocks follow Eastern Standard Time (UTC−5) in winter and shift to Eastern Daylight Time (UTC−4) from mid-March through early November. If you are coordinating a call from the West Coast, remember that this region is three hours ahead of Pacific Time, so a 9:00 AM call in California reaches a 410 number at 12:00 PM local time.
Tip: Business hours across the 410 region generally run 9:00 AM to 5:00 PM Eastern Time, Monday through Friday.
How to Dial a 410 Number
Because area code 410 operates as part of an overlay, 10-digit dialing is mandatory for every local and long-distance call. You must dial the full 10-digit number (410 + the seven-digit line number) even when calling a neighbor across the street. For international callers, dial your country’s exit code, then +1 (the North American country code), then 410, followed by the seven-digit local number.
Scam Alerts for the 410 Area Code
Like every U.S. area code, 410 has been used by scammers who spoof local numbers to appear trustworthy. Residents in Baltimore, Annapolis, Columbia, Towson, Dundalk, Ellicott City, Glen Burnie, Salisbury, Ocean City should stay alert to the following common tactics:
| Scam Type | What to Watch For |
|---|---|
| IRS / Tax Scams | Callers impersonating the IRS and threatening arrest over supposed unpaid taxes. |
| Utility Shut-off | Fake BGE callers demanding instant payment to keep your power on. |
| Toll / E-ZPass Scam | Texts claiming you owe an unpaid Maryland toll and linking to a fake payment page. |
| Medicare / Health Scam | Robocalls seeking Medicare numbers under the guise of free braces or test kits. |
If you receive a suspicious call from a 410 number, take these steps to protect yourself:
- Do not share personal information such as Social Security numbers, bank details, or passwords over the phone.
- Hang up and verify by calling the organization back using an official number from its website.
- Report the call to the FTC at reportfraud.ftc.gov and to the Maryland Attorney General’s Office.
- Block the number and consider registering with the National Do Not Call Registry.
Red Flag: Legitimate agencies such as the IRS, Social Security Administration, or your utility company (BGE, Pepco, or Potomac Edison) will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Any 410 caller making such a demand is a scammer.
History and Economy of the 410 Region
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Area code 410 was created in 1991 when eastern Maryland was split from the original 301 code to relieve number exhaustion. Demand kept climbing, so the 443 overlay was added in 1997 and a second overlay, 667, followed in 2012 – all three now blanket the same eastern-Maryland territory. The regional economy is diverse and deep: the Port of Baltimore is one of the busiest on the East Coast, Johns Hopkins University and its hospital anchor a world-class medical and research sector, and Annapolis serves as both the state capital and home to the U.S. Naval Academy. Howard County’s Columbia and Ellicott City form a booming technology and cybersecurity corridor near Fort Meade, while the Eastern Shore contributes agriculture, poultry, and the summer tourism economy of Ocean City.
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Looking Up a 410 Number
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To find out who is calling from a 410 number, run a reverse phone lookup or search the full 10-digit number online. Baltimore-area businesses, hospitals, and government offices publish their 410 numbers widely, so a legitimate caller is often easy to confirm with a quick search.
Nearby & Related Area Codes
Maryland is served by several area codes. If you are researching 410, these neighboring and overlay codes are worth knowing:
- 443 – Baltimore overlay (same region)
- 667 – Baltimore overlay (same region)
- 301 – Western MD & DC suburbs
- 240 – DC suburbs overlay
You can also browse our full directory of Maryland area codes for more regional guides.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Maryland:
- Pennsylvania – area code 215
- Delaware – area code 302
- Virginia – area code 804
- West Virginia – area code 304
Frequently Asked Questions
Where is the 410 area code located?
The 410 area code covers eastern Maryland, including Baltimore, Annapolis, Columbia, and the entire Eastern Shore out to Salisbury and Ocean City.
Do I need to dial 10 digits for 410?
Yes. Because 410 shares overlays with the 443 and 667 area codes, 10-digit dialing is required for every local call.
What other area codes overlay 410?
The 443 (added 1997) and 667 (added 2012) area codes are overlays covering the same eastern-Maryland region as 410.
What time zone is the 410 area code in?
The 410 area code observes Eastern Time (EST/EDT).
Related 410 Guides
- Is a 410 call safe? Read Is area code 410 a scam? Spam & safety guide.
- Local coverage: see the Baltimore area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.