Mount Ida is a city located in the U.S. state of Arkansas. It is within and the county seat of Montgomery County which is founded 1842. It has a total area of 1.63 square miles at 34°33′14″N 93°37′50″W.The elevation is 666 feet above sea level. According to the 2010 census, the total population was 1,076. The population density was 636.59/sq mi. Estimated per capita income in 2015 was $19,002. It has Zip code 71957.