Jerome is a city in Jerome County, Idaho, U.S.A. The population was 10,890 at the 2010 census. The city is the county seat of Jerome County, and sits at an elevation of 3763 feet (1147 m) above sea level. It is part of the Twin Falls, Idaho Micropolitan Statistical Area. According to the U.S. Census, the city has a total area of 3.2 square miles (8.3 Square km), all of it land.