Llano is a city in Llano County, Texas, United States. As of 2020, the city population was 3,325. It is the county seat of Llano County. Llano ha…Llano is a city in Llano County, Texas, United States. As of 2020, the city population was 3,325. It is the county seat of Llano County. Llano has been described as the "deer capital of Texas", with the single highest density of white-tailed deer in the United States.