Waldorf, Maryland 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. Its subsequent substantial growth as a residential community began
John Jacob Astor Astor correctly predicted New York's rapid growth northward on Manhattan Island, and he purchased more and more land beyond the then-existing city limits. Astor rarely built on his land, but leased it to others for rent and their use. After retiring from his business, Astor spent the rest of his life as a patron of culture. He supported the ornithologist John James Audubon in his studies, art work, and travels, and the presidential campaign of Henry Clay. On September 19, 1785, Astor married Sarah Cox Todd, who died in 1834. Her parents were Scottish immigrants Adam Todd and Sarah Cox.