- Direction:
- North/South
- Southern Terminus:
- Virginia-Maryland state line
- Northern Terminus:
- Jefferson National Pike (US 15) and Catoctin Mountain Highway (US 15) in Frederick
- Distance:
- 12.30 miles
- Counties:
- Washington, Frederick
- Signed:
- Yes
US 340 is a north/south route extending from Greenville, Virginia, to Frederick, Maryland. It enters Maryland from Virginia via a two-lane bridge over the Potomac River. On the other side, it widens to become a four-lane expressway. At first, it continues the name from Virginia, Jefferson Pike. After a few exits, Jefferson Pike splits off to become MD 180, while US 340 continues northeast as Jefferson National Pike. In Frederick, Jefferson National Pike merges with Catoctin Mountain Highway (US 15) and continues northeast with the designation of US 15. US 340 is signed as being multiplexed with US 15 until US 40, but it is listed as officially ending at the merge in state documents.
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Copyright © 2003-2020 by David Golub. All rights reserved. The author would like to thank William Roll for contributing photographs and LC for contributing documents to this web site. You may not reproduce any text or photographs on this web site without express permission from the author. Hotlinking of images from this site is strictly prohibited. Route symbols based on graphics from Central PA/MD Roads and Wikipedia. Map icons by MapGlyphs.com.