Sponsored Topics. Redkey is a town in Richland Township, Jay County, Indiana, United States. The population was 1,353 at the 2010 census. Redkey is located at 40°20′58″N 85°9′4″W / 40.34944°N 85.15111°W / 40.34944; -85.15111 (40.349507, -85.151074). According to the United States Census Bureau, the town has a total area of 0.9 square miles (2.4 km²), all land.