Louisa (originally named Louisa Court House) is a town in Louisa County, Virginia, United States. The population was 1,401 at the 2000 census. It is the county seat of Louisa County. According to the United States Census Bureau, the town has a total area of 1.8 square miles (4.7 Square Kilometer), of which, 1.8 square miles (4.7 Square Kilometer) of it is land and 0.55% is water.Louisa is home to the North Anna Nuclear Generating Station which produces electricity and jobs for the county's inhabitants. The warm water produced from the power plant and discharged into the water of Lake Anna creates what some call Central Virginia's best fishing.