Smithsburg is a town in Washington County, Maryland, United States. Its population was 2,146 at the 2000 census and latest 2008 estimates are at 2,908. Smithsburg is close to Fort Ritchie army base and just west of the presidential retreat Camp David. Smithsburg, MD was founded in 1813 by Christopher Stuffle Smith. Mr. Smith purchased a plot of land formerly known as part of Shadrack's Lot..