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The blue area is assigned area codes 301, 240, and 227; the red area is area codes 410, 443 and 667. The state of Maryland is served by the following area codes: Area codes. Numbering plan area. 227.
Area code 301 was the first area code for all of Maryland, from 1947, when the area code system was created, until 1991, when everything from Baltimore eastward split off as area code 410. In 1997, area code 240 was added as an overlay area code for the 301 territory. On June 14, 2023, a third overlay code, 227, was added to provide more ...
Area codes 202 and 771. Coordinates: 38°54′N 77°2′W. The red area is the District of Columbia, served by area codes 202 and 771. Area codes 202 and 771 are telephone area codes in the North American Numbering Plan (NANP) for Washington, D.C. Area code 202 was one of the original North American area codes established in October 1947 by AT&T.
By 2011, the 410/443 area was once again running out of numbers because of the continued proliferation of cell phones. To spare residents another number change to a new area code, a third overlay code, area code 667, was implemented on March 24, 2012. [5] This had the effect of assigning 24 million numbers to just over four million people.
The Bethesda campus has been occupied since 1938 when the original National Institute of Health began to expand outside of Washington, D.C. [1] The Clinical Center, Building 10, opened in 1953 with 540 beds, thus allowing for clinical research. Launched in the wake of Nazi medical experiments done during World War II, research protocols here ...
The Howard Hughes Medical Institute (HHMI) is an American non-profit medical research organization based in Chevy Chase, Maryland. [3] [4] It was founded in 1953 by Howard Hughes, an American business magnate, investor, record-setting pilot, engineer, [5] film director, and philanthropist, known during his lifetime as one of the most financially successful individuals in the world.
Area code 606 is a telephone area code serving the eastern half of south-central and all of the eastern part of the Commonwealth of Kentucky. Cities and towns in the area code include Ashland, Morehead, Hazard, Middlesboro, Somerset, Stanford, London, Corbin, Greenup, Paintsville, Pikeville and Maysville. Most of its service area lies within ...
According to the United States Census Bureau, the North Bethesda CDP has a total area of 8.9 square miles (23 km 2), all land. Significant through-roads in North Bethesda include Interstates 270 and 495 and Maryland State Highways 187 (Old Georgetown Road), 355 (Rockville Pike), and 547 (Strathmore Avenue).
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