Cadiz is a city in Trigg County, Kentucky, United States. The population was 2,373 at the 2000 census. It is the county seat of Trigg County. It is an old town located close to the Land Between the Lakes, a popular recreation area, and was a base of Union and Confederate operations in the American Civil War.Cadiz is part of the Clarksville, TN–KY Metropolitan Statistical Area, and is located in a wet county as of September 2009.