Area Code 443 Location

Area Code 443 – Baltimore, Maryland

Area code 443 serves Baltimore, Maryland, and a wide swath of eastern Maryland. Introduced in 1997 as an overlay to area code 410, it spans the Baltimore metro, Annapolis, and communities around the Chesapeake Bay and the Eastern Shore. Because 443 overlays the same territory as 410 (along with later 667), you’ll see it on new mobile and landline numbers across the region. It connects major ports, campuses, neighborhoods, and business hubs that shape Greater Baltimore.

Cities and landmarks within the 443/410/667 overlay include:

• Baltimore (Inner Harbor, Fort McHenry, Camden Yards, National Aquarium)
• Annapolis (U.S. Naval Academy)
• Towson, Dundalk, Essex, Parkville
• Columbia and Ellicott City
• Glen Burnie and Pasadena
• Bel Air, Aberdeen, Havre de Grace
• Salisbury, Easton, Cambridge
• Ocean City (Boardwalk and beaches)

Ten-digit dialing is required for all local calls in the 443/410/667 complex, a standard practice for overlay area codes. This approach adds number capacity without changing existing phone numbers, which helps residents and businesses keep their contacts. Fun fact: Fort McHenry in Baltimore inspired “The Star-Spangled Banner,” and many 443 numbers ring near iconic spots like M&T Bank Stadium and the Inner Harbor. If you get a call from 443, it most likely comes from Maryland’s Baltimore–Annapolis–Eastern Shore corridor.

“Overlay codes require ten-digit dialing for all calls.” — North American Numbering Plan Administrator (NANPA)