Locations for Area Code - 443

Area code 443 is an overlay for area code 410 in Maryland, serving Baltimore, Annapolis, and the surrounding regions. Introduced in 1997, it was the first overlay for the state and required ten-digit dialing. The region is a mix of historic urban centers, naval installations, and suburban sprawl, with strong influences in government, healthcare, and education. While 410 retains legacy status, 443 is widely used across new phone lines. Area code 443 reflects the modern evolution of Maryland’s most densely populated corridor and complements the rich history and vibrancy of the 410 region.