Area code 410 covers much of eastern Maryland, including Baltimore, Annapolis, and the Eastern Shore. It was created in 1991 from a split of the original 301 area code, and in 1997, overlay code 443 was introduced, followed by 667 in 2012. The 410 region includes major historical and cultural landmarks, including the U.S. Naval Academy, Inner Harbor, and Johns Hopkins University. It serves a population dense with government, healthcare, and port-related industries. Despite the overlays, 410 remains the most iconic and recognizable area code in Maryland. It is frequently used in music, business names, and as a symbol of Baltimore pride.