Keo is a town located in the U.S. state of Arkansas. It is within Lonoke County included in the Little Rock-North Little Rock–Conway Metropolitan Statistical Area. It has a total area of 4.73 square miles at 34°36′19″N 92°0′36″W. The elevation is 230 feet above sea level. As of the 2010 census data, it had a total population of 5,476. The population density was 55.15/sq mi. Estimated per capita income in 2015 was $26,117. It is using Zip code 72083.