top of page


area code

Biggest city:





Eastern (GMT -5)

Nearby area codes: 

Zip codes



Major Cities:

Baltimore, Columbia, Ellicott City, Elkridge, Waterloo, Glen Burnie, Severn, Annapolis, Severna Park, Odenton, Crofton, Pasadena, Arnold, Lake Shore, Ferndale, others


Average Income:





Unemployment Rate:

The 443 area code is an integral part of the telecommunications landscape in Maryland, USA. Geographical Coverage: Area code 443 is primarily located in the state of Maryland. It encompasses a wide geographical area, covering significant cities such as Baltimore, Columbia, Ellicott City, Glen Burnie, and Dundalk. Additionally, it spans across 17 counties, which include Baltimore City County, Baltimore County, Anne Arundel County, Harford County, and Howard County. History and Implementation: This area code was officially assigned on June 21, 1996, and was put into service on June 1, 1997. The creation of area code 443 was a response to the congestion in the 410 area code. To alleviate this issue, the Maryland Public Service Commission established the 443 area code, making it an overlay area code. This means that it shares the same geographical area as the 410 area code, providing additional numbering resources to the region. Largest City and Time Zone: The largest city served by the 443 area code is Baltimore, a major urban center in Maryland. This area code operates in the Eastern Standard Time (EST) zone. This is particularly important for businesses and individuals making calls to this area, as they need to be aware of the time difference, especially during periods of Daylight Saving Time adjustments. In conclusion, area code 443 plays a vital role in Maryland's communication infrastructure, covering a wide geographical area with multiple cities and counties, and has a history that reflects the evolving needs of the region's telecommunication systems. Understanding these aspects of the 443 area code is essential for anyone dealing with telecommunications in this part of the United States.
bottom of page