WHAT YOU NEED TO KNOW
Area code 410 serves the Baltimore metro area and surrounding Maryland counties, including Baltimore, Annapolis, Towson, and Columbia. Established in November 1991 as a split from area code 301, it covers approximately 3.1 million residents and is the primary local code for businesses and households across central and eastern Maryland.
- Population: ~3.1 million residents in the coverage area
- Overlay: Overlay: 443 (added 1997), 667 (added 2012)
- Dialing: 10-digit dialing required
- Source Type: Local geographic code
Geographic Coverage
Area code 410 covers a broad geographic region in Maryland, including Baltimore City, Baltimore County, Anne Arundel County, Howard County, Harford County, Cecil County, Queen Anne's County, and parts of the Eastern Shore. Major population centers include Baltimore, Annapolis (the state capital), Towson, Columbia, Ellicott City, Glen Burnie, Bel Air, and Aberdeen. The code spans urban, suburban, and rural communities across central and northeastern Maryland.
Population and Business Context
The 410 area code covers one of the larger metro markets on the East Coast. Baltimore is the anchor city, with a significant concentration of healthcare, education, logistics, and financial services businesses. The Port of Baltimore ranks among the busiest on the East Coast. Annapolis hosts Maryland state government operations and a strong maritime tourism economy. Howard County, home to Columbia, consistently ranks among the most affluent counties in the United States.
Area Code History
Area code 410 was created on November 1, 1991, when it split from area code 301, which had covered all of Maryland since the original North American Numbering Plan was established in 1947. The split was driven by growing demand for phone numbers in the Baltimore metro area. Area code 443 was introduced as an overlay in 1997 to address further number exhaustion, followed by area code 667 added as an additional overlay in 2012.
How to Dial
Because area code 410 shares its geographic territory with overlays 443 and 667, all local calls within the region require 10-digit dialing. This means you must dial the full 10-digit number (area code plus the 7-digit local number) even when calling within the same area code. Long-distance calls outside the region follow the standard 1 plus 10 digits format. There is no additional cost associated with 10-digit local dialing.
Need a 410 Number for Your Baltimore Business?
Businesses operating in the Baltimore metro area, Annapolis, or anywhere across the 410 coverage zone can provision a local 410 tracking number through Convirza. A local number signals presence to Maryland customers and lets you measure exactly which campaigns, channels, and keywords are driving inbound calls. Convirza provisions trackable local numbers in any North American area code, with numbers ready to deploy in minutes. With a Convirza 410 number, every incoming call is automatically recorded, scored for quality and intent, and attributed to its traffic source using dynamic number insertion (DNI). Calls can be routed to any team member, office location, or call center - with full reporting available in real time. You get clear data on what is driving phone leads without changing how your business receives calls.
750+ customers · 25 years of call data