Grant County courthouse in Ulysses, Kansas; seen from the west. – Ammodramus, CC0 – Wikimedia Commons Grant County is located in Kansas. About 7,352 people live here (as of 2020). Between 2010 and 2020, the population declined from 7,829 to 7,352. The area covers about 1,489.0 square kilometers. The region is divided into 3 Subregions. The region was founded in 1873. The name originates from Ulysses S. Grant (president of the United States from 1869 to 1877) Grant County is county in Kansas, United States. More information at www.GrantCoKS.org.