Waldorf is an unincorporated community and census-designated place in Charles County, Maryland, United States. It is located 23 miles (37 km) south-southeast of Washington. The population of the census-designated area (excluding the CDP of St. Charles) was 67,752 at the 2010 census. Waldorf was settled before 1900 as a rural crossroads with a train station and was called "Beantown" after a local family.
Waldorf's original name was Beantown. During his post-assassination flight, John Wilkes Booth told a road sentry he was headed to his home in Charles County near Beantown and was allowed to proceed. In 1880, the General Assembly of Maryland by an act changed the name to "Waldorf" in honor of William Waldorf Astor (1848–1919), the great-grandson of John Jacob Astor (1763–1848), who was born in Walldorf, Palatinate, Germany. On July 29, 1908, the city of Plumb Valley in Waseca County, Minnesota, changed its name to Waldorf after Waldorf, Maryland.
Once a tobacco market village, Waldorf came to prominence in the 1950s as a gambling destination after slot machines were legalized in Charles County in 1949. The boom lasted until 1968, when gambling was once again outlawed.