Louisa (originally named Louisa Court House) is a town in Louisa County, Virginia, United States. The population was 1,555 at the 2010 census. It is the county seat of Louisa County.
Bloomington, Boxley Place, the Louisa County Courthouse, and Louisa High School are listed on the National Register of Historic Places.
Louisa is located at 38°1′27″N 78°0′6″W (38.024057, −78.001584).
According to the United States Census Bureau, the city has a total area of 1.8 square miles (4.7 km²), of which 1.8 square miles (4.7 km²) is land and 0.55% is water.
At the 2000 census there were 1,401 people, 584 households, and 331 families in the town. The population density was 766.8 people per square mile (295.6/km²). There were 620 housing units at an average density of 339.4 per square mile (130.8/km²). The racial makeup of the town was 66.81% White, 29.48% African American, 0.79% Native American, 0.71% Asian, 0.79% from other races, and 1.43% from two or more races. Hispanic or Latino of any race were 1.43%.
Of the 584 households 30.0% had children under the age of 18 living with them, 35.6% were married couples living together, 16.4% had a female householder with no husband present, and 43.3% were non-families. 37.0% of households were one person and 18.3% were one person aged 65 or older. The average household size was 2.25 and the average family size was 2.93.