Xenia is a city in Greene County, Ohio, United States, and its county seat. Located in southwestern Ohio, it is 15 miles (24 km) east of Dayton and is part of the Dayton metropolitan area as well as the Miami Valley region. As of the 2020 census, the city had a population of 25,441. The city's name comes from the Greek word Xenia (ξενία), which means 'hospitality'.