Oxford is a city in Izard County, Arkansas, United States. The population was 670 at the 2010 census. Oxford is located in northern Izard Cou…Oxford is a city in Izard County, Arkansas, United States. The population was 670 at the 2010 census. Oxford is located in northern Izard County at 36°13′3″N 91°55′8″W / 36.21750°N 91.91889°W. Its northern border is the Fulton County line.