Sidney is a town located in the U.S. state of Arkansas. It is within Sharp County with a total area of 2.13 square miles at 36°0′16″N 91°39′33″W. The elevation is 610 feet above sea level. As of the 2010 census data, it had a total population of 181. The population density was 88.10/sq mi. Estimated per capita income in 2016 was $17,769. It has Zip code 72577.