Founded by Carl Lindner Sr., who opened his and the city's first cash-and-carry retail dairy store in 1940, United Dairy Farmers (UDF) changed the way Cincinnati bought its milk. UDF -- which buys milk from area dairy farmers, then processes and packages it for sale in its stores -- has grown into a chain of more than 200 convenience store locations in Ohio, Indiana, and Kentucky. The company, still owned and run by the Lindner family, sells its own milk products, its Homemade brand ice cream, and a variety of other food products at its stores. UDF locations also offer in-store ice cream parlors and sell Exxon Mobil gasoline.