According to the United States Census Bureau, the city has a total area of 10.3squaremiles (26.7Square kilometers), of which, 10.2square miles (26.5Square kilometers) of it is land and 0.04squaremiles (0.1Square kilometer) of it (0.39%) is water. Evanston is a city in Uinta County, Wyoming, United States. The population was 12,359 at the 2010 census. It is the county seat of Uinta County. Evanston has a continental climate with long, cold, dry winters and short, warm, slightly wetter summers.