Roberts County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 929, making it the seventh-least populous county in Texas. Its county seat is Miami. The county was created in 1876 and organized in 1889. It is named for Oran Milo Roberts, a governor of Texas. Roberts County is one of 30 prohibition, or entirely dry, counties in the state of Texas.