Hardy is the 2nd oldest city in Sharp and Fulton counties in the U.S. state of Arkansas. The population was 765 in 2020. Hardy is located at 36°19′14″N 91°28′50″W / 36.32056°N 91.48056°W. The Spring River, which begins in Mammoth Spring, flows through Hardy. The Spring River flows into the Black River, which flows into the White River, and the White River eventually empties into the Mississippi River.