杰罗姆县（Jerome County, Idaho）是位于美国爱达荷州南部的一个县。面积1,559平方公里。根据美国2000年人口普查，共有人口18,342人 (2005年估计为19,638人)。县治杰罗姆 (Jerome)。

成立于1919年2月8日，县名可能纪念杰罗姆·希尔 (Jerome Hill，蛇河平原上North Side灌溉计划的开发商)、其女婿Jerome Kuhn或其外孙Jerome Kuhn, Jr.。

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.