410

The 410 area code, serving the state of Maryland, notably Baltimore and its surrounding areas, presents several key aspects: Geographic Coverage: The 410 area code is predominantly used for telephone numbers in Baltimore, Maryland, and its surrounding areas. It encompasses several notable cities such as Annapolis, Arnold, Bel Air South & North, Towson, and Dundalk. In terms of county coverage, this area code extends over 17 counties, including Baltimore City County, Baltimore County, Anne Arundel County, Howard County, and Harford County, collectively covering 125 cities​​​​. History and Implementation: The 410 area code was officially assigned on December 28th, 1990, and became active on October 6th, 1991. It was introduced as a General Purpose Code, following a split from the older 301 area code. This transition marked a significant development in the area's telecommunication infrastructure, adapting to the growing need for more telephone numbers due to increased population and telecommunication devices​​. Overlay Codes and Time Zone: To accommodate the increasing demand for phone numbers, the 410 area code has two overlay codes - 443 and 667. These overlays serve the same geographical area as the 410 code, allowing for a greater number of unique phone numbers within the region. Additionally, the entire 410 area code observes Eastern Standard Time, aligning it with the predominant time zone of the eastern United States​​. In conclusion, the 410 area code is a significant component of Maryland's telecommunication landscape, with its extensive coverage, historical significance, and necessary adaptations like overlay codes to meet the demands of modern communication. Its implementation reflects the evolving nature of telecommunication infrastructure in response to societal and technological changes.