There are 3 US Post Offices in Jerome County serving a total of 22,540 residents equating to 7,513 residents per post office. It's estimated that approximately 35,976 packages are handled across the 3 county post offices annually. Jerome County is a county in the U.S. state of Idaho. As of the 2010 Census the county had a population of 22,374. The county seat and largest city is Jerome. The county was created by the Idaho Legislature on February 8, 1919, by a partition of Lincoln County. It was named after either Jerome Hill, a developer of the North Side Irrigation Project, his son-in-law Jerome Kuhn, or his grandson Jerome Kuhn, Jr. Jerome County is part of the Twin Falls, ID Micropolitan Statistical Area. The Minidoka Relocation Camp, one of ten Japanese American internment camps set up during World War II, was located in Jerome County, six miles north of Eden."