or flow through the state, including the Yellowstone River, Bighorn River, Green River, and the Snake River. Basins Much of Wyoming is covered with large basins containing different eco-regions, from shrublands to smaller patches of desert. Regions of the state classified as basins contain everything from large geologic formations to sand dunes and vast unpopulated spaces. Basin landscapes are typically at lower elevations and include rolling hills, valleys, mesas, terraces and other rugged terrain, but also include natural springs as well as rivers and artificial reservoirs. They have common plant species such as various subspecies of sagebrush, juniper and grasses such as wheatgrass, but basins are known for their diversity of plant and animal species. Islands Wyoming has 32 named islands; the majority are in Jackson Lake and Yellowstone Lake, within Yellowstone National Park in the northwest portion of the state. The Green River in the southwest also contains a number of islands. Regions and administrative divisions Counties The state of Wyoming has 23 counties. Wyoming license plates have a number on the left that indicates the county where the vehicle is registered, ranked by an earlier census. Specifically, the numbers are representative of the property values of the counties in 1930. The county license plate numbers are: Cities and towns The State of Wyoming has 99 incorporated municipalities. In 2005, 50.6% of Wyomingites lived in one of the 13 most populous Wyoming municipalities. Metropolitan areas The United States Census Bureau has defined two metropolitan statistical areas (MSA) and seven micropolitan statistical areas (MiSA) for the state. In 2008, 30.4% of Wyomingites lived in either of the metropolitan statistical areas, and 73% lived in either a metropolitan or a micropolitan area. Demographics Population The United States Census Bureau estimated the population of Wyoming was 578,759 in 2019; in 2020, it had a 2020 census population of 576,851. The center of population of Wyoming is in Natrona County. In 2014, the United States Census Bureau estimated the population's racial composition was 92.7% white (82.9% non-Hispanic white), 2.7% American Indian and Alaska Native, 1.6% Black or African American, 1.0% Asian American, and 0.1% Native Hawaiian or Pacific Islander. As of 2011, 24.9% of Wyoming's population younger than age1 were minorities. According to data from the American Community Survey, as of 2018, Wyoming was the only U.S. state where African Americans earn a higher median income than white workers. According to the 2010