Maryland
(443) Area Code 443 — Baltimore, Maryland
443 Area Code – Baltimore, Maryland: Location, Time Zone & History
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Map of Area Code 443
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History & Cultural Notes
Baltimore's phone numbers were split off from area code 301 on October 6, 1991, forming area code 410 for the metropolitan area and the Eastern Shore. Growth from cellphones and pagers pushed that supply toward exhaustion within about five years, and 443 went into service as an overlay on June 1, 1997, the same year Maryland introduced its first overlay, 240, over the western suburbs and Washington region. A second overlay, 667, followed on March 24, 2012, after the combined 410/443 pool was projected to run out.
By 2020, the U.S. Census counted roughly 4.3 million people across the combined numbering plan area, covering Baltimore, Annapolis, Columbia, Ellicott City, Glen Burnie, and Towson on Eastern Time.
The region's economy centers on healthcare and biomedical research anchored by Johns Hopkins, shipping and logistics through the Port of Baltimore, defense and aerospace work at Aberdeen Proving Ground, finance and insurance, and tourism around the Inner Harbor. Fort McHenry, in Baltimore Harbor, is the birthplace of the Star-Spangled Banner, while the Eastern Shore's Chesapeake Bay blue crab industry remains central to the region's identity.