Blanco is a city in rural Blanco County, Texas, United States. The population was 1,682 at the 2020 census. Blanco is a cattle and ranc…Blanco is a city in rural Blanco County, Texas, United States. The population was 1,682 at the 2020 census. Blanco is a cattle and ranching community. As of the 2020 United States census, there were 1,682 people, 978 households, and 530 families residing in the city.