sentences:  At one time, Union County had a population of over 20,000.There were a number of bustling communities such as Amistad, Hayden, Sedan, Pasamonte, Gladstone, Mt Dora, Grenville, Des Moines, Folsom, and Dedman (now known as Capulin).According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.2%) is water.