Cadiz (locally (listen) KAY-deez, -diz) is a home rule-class city and the county seat of Trigg County, Kentucky, United States. The population was 2,558 at the 2010 census. It is part of the Clarksville metropolitan area.
Cadiz is an historic town located close to the Land Between the Lakes, a popular recreation area. It was a base of Union and Confederate operations during the Civil War. It permits the sale of alcoholic beverages.
William Henry Perrin's 1884 History of Trigg County does not explain the origin of Spanish name of the town. In May 1820 the county commission chose to use Robert Baker's land as the site of the county seat. He relinquished his stable yard and the surrounding 50 acres (200,000 m2). From August to October, the commission platted the town in blocks and named it as Cadiz.