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is a town in Washington County, Maryland, United States. The population was 482 as of the 2000 Census. In 01 July 2007, the U.S. Census Bureau estimated the population to be 840, a 74.3% increase from 2000.
According to the United States Census Bureau, the town has a total area of 0.9 square miles (2.2 km²), all of it land.
Keedysville is underlain by the Tomstown Dolomite, a carbonic rock formation of the Cambrian. The Tomstown is known for producing most of the caves in Washington County, especially in the area surrounding Keedysville. The area was once home to eight different caves, several of which were discovered during quarrying operations to remove rock for highway construction. The most famous of these caves, Crystal Grottoes, was discovered in 1920 and is now the only show-cave in Maryland.
The high concentration of caves in this area may be related to increased drainage of ground water. The watertable in this locality is drained by the Little Antietam Creek and its tributaries, and many of these caves can be found in the cliffs and along the broken plateau east of town.