Baltimore, Maryland

Where Is Area Code 443?

Area code 443 serves Baltimore and much of eastern Maryland. It covers the same region as area codes 410 and 667. This service area includes Baltimore City, nearby suburbs, and a wide stretch of central and eastern Maryland.

Major places in the 443 area include Baltimore, Annapolis, Columbia, Towson, and Ocean City. The code also serves many communities in counties such as Baltimore County, Anne Arundel County, Howard County, Harford County, and parts of the Eastern Shore. Because 443 is an overlay, people in these places may also use 410 or 667.

This area includes well-known Maryland landmarks and geographic features. Baltimore sits on the Patapsco River and the Chesapeake Bay watershed. The broader 443 region also includes the Inner Harbor in Baltimore, the state capital of Annapolis on the Chesapeake Bay, and coastal communities near the Atlantic Ocean.

History of Area Code 443

Area code 443 was introduced in 1997 as an overlay for area code 410. Area code 410 had been created in 1991 when it split from area code 301. The new 443 code was added because the region needed more telephone numbers.

Area code 443 did not replace 410. It covered the same geographic area, which made 10-digit dialing necessary for local calls in the overlay region. In 2012, area code 667 was added as another overlay for the same 410 and 443 service area as demand for numbers continued to grow.

Key Facts About Area Code 443

• Area code 443 is in Maryland, and Baltimore is the largest city commonly linked with it.
• Area code 443 serves the same territory as area codes 410 and 667 in eastern and central Maryland.
• Area code 443 began service in 1997 as an overlay to area code 410.
• Area code 410 was created in 1991 in a split from Maryland's original statewide area code, 301.
• Area code 443 uses the Eastern Time Zone, including Eastern Standard Time and Eastern Daylight Time.
• Area code 443 covers Baltimore City and parts of many counties, including Anne Arundel, Baltimore, Harford, Howard, and communities on the Eastern Shore.
• Major institutions in the 443 service area include Johns Hopkins University in Baltimore and the United States Naval Academy in Annapolis.
• Area code 667 was added in 2012 as a second overlay for the same 410 and 443 region.

Frequently Asked Questions

What state is area code 443 in?

Area code 443 is in Maryland.

What major cities use area code 443?

Major cities and communities that use area code 443 include Baltimore, Annapolis, Columbia, Towson, and Ocean City.

Is area code 443 a toll-free number?

No. Area code 443 is a geographic area code for parts of Maryland.