Junction City is a city located in the U.S. state of Arkansas. It is within Union County and twin city of neighboring Junction City in Louisiana. It has a total land area of 1.13 square miles at 33°1′9″N 92°43′22″W. The elevation is 194 feet above sea level. As of the 2010 census data, it had a total population of 581. The population density was 478.30/sq mi. Estimated per capita income in 2015 was $15,842. It is using Zip code 71749.