This is a list of U.S. county name etymologies, covering the letters J to M.
J
County name State Name originJack County Texas Patrick Churchill Jack and his brother William Houston Jack, both soldiers of the Texas RevolutionJackson County Alabama Andrew Jackson, the seventh president of the United StatesJackson County ArkansasJackson County ColoradoJackson County FloridaJackson County IllinoisJackson County IndianaJackson County IowaJackson County KansasJackson County KentuckyJackson County MichiganJackson County MinnesotaJackson County MississippiJackson County MissouriJackson County North CarolinaJackson County OhioJackson County OklahomaJackson County OregonJackson County TennesseeJackson County TexasJackson County West VirginiaJackson County WisconsinJackson Parish LouisianaJackson County Georgia James Jackson, a U.S. Congressman and the 23rd Governor of Georgia Jackson County South Dakota J.R. Jackson, a legislator of the Dakota TerritoryJames City County Virginia Named for James City (Virginia Company) (one of four incorporations of the Virginia Colony), itself named for James I of England by his son, King Charles IJasper County Georgia William Jasper, a hero of the Battle of Sullivan's Island during the American Revolutionary WarJasper County IllinoisJasper County IndianaJasper County IowaJasper County MississippiJasper County MissouriJasper County South CarolinaJasper County TexasJay County Indiana John Jay, the first U.S. Secretary of State and first Chief Justice of the Supreme CourtJeff Davis County Georgia Jefferson Davis, president of the Confederate StatesJeff Davis County TexasJefferson County Alabama Thomas Jefferson, the third president of the United StatesJefferson County ArkansasJefferson County FloridaJefferson County GeorgiaJefferson County IdahoJefferson County IllinoisJefferson County IndianaJefferson County IowaJefferson County KansasJefferson County KentuckyJefferson County MississippiJefferson County MissouriJefferson County MontanaJefferson County NebraskaJefferson County New YorkJefferson County OhioJefferson County OklahomaJefferson County OregonJefferson County PennsylvaniaJefferson County TennesseeJefferson County TexasJefferson County WashingtonJefferson County West VirginiaJefferson County WisconsinJefferson Parish LouisianaJefferson County Colorado Named for the extralegal Jefferson Territory (itself named for U.S. President Thomas Jefferson), of which the county was a part from 1859 to 1861Jefferson Davis County Mississippi Jefferson Davis, president of the Confederate StatesJefferson Davis Parish LouisianaJenkins County Georgia Charles Jones Jenkins, the 44th Governor of GeorgiaJennings County Indiana Jonathan Jennings, the first Governor of IndianaJerauld County South Dakota H.A. Jerauld, a legislator of the Dakota TerritoryJerome County Idaho Named for the town of Jerome, Idaho, named in turn for Jerome Hill, an investor in the North Side Twin Falls Canal Company. Jersey County Illinois The U.S. state of New JerseyJessamine County Kentucky Named for Jessamine Creek, so called because of the jasmine plants that grow next to it.Jewell County Kansas Colonel Lewis R. Jewell of the Sixth Kansas Cavalry RegimentJim Hogg County Texas James Hogg, the 20th Governor of TexasJim Wells County Texas James B. Wells Jr., a judge and Democratic boss in South TexasJo Daviess County Illinois Joseph Hamilton Daveiss, a soldier killed at the Battle of TippecanoeJohnson County Arkansas Ben Johnson, a judge in the Arkansas TerritoryJohnson County Georgia Herschel Vespasian Johnson, a U.S. Senator and the 41st Governor of GeorgiaJohnson County Illinois Richard Mentor Johnson, a U.S. Congressman and the 9th Vice President of the United StatesJohnson County IowaJohnson County KentuckyJohnson County MissouriJohnson County NebraskaJohnson County Indiana John Johnson, a judge of the Indiana Supreme CourtJohnson County Kansas Thomas Johnson, an early Methodist missionary to the Shawnee tribe in KansasJohnson County Tennessee Thomas Johnson, an early settler of the areaJohnson County Texas Middleton Johnson, a Texas Ranger, soldier, and politicianJohnson County Wyoming E. P. Johnson, a Cheyenne attorneyJohnston County North Carolina Gabriel Johnston, the 6th Colonial Governor of North CarolinaJohnston County Oklahoma Douglas H. Johnston, the last governor of the Chickasaw NationJones County Georgia James Jones, a U.S. Representative from GeorgiaJones County Iowa George Wallace Jones, one of the first two U.S. senators to represent IowaJones County South DakotaJones County Mississippi John Paul Jones, commander of the Continental Navy during the American Revolutionary WarJones County North Carolina Willie Jones, a Revolutionary leader and president of the North Carolina Council of SafetyJones County Texas Anson Jones, the last President of the Republic of TexasJosephine County Oregon Named for a creek, itself probably named after Virginia Josephine Rollins OrtJuab County Utah A Ute word meaning "valley" or "plain"Judith Basin County Montana Named by explorer William Clark for his future wife, Julia "Judith" Hancock Juneau County Wisconsin Solomon Juneau, a French-Canadian trader who helped found and was the first mayor of MilwaukeeJuneau City and Borough Alaska Joseph Juneau, a Canadian gold prospector who co-founded the city of JuneauJuniata County Pennsylvania An Iroquoian word, onayutta, meaning "standing stone"
K