[2] Louisa County is part of the Muscatine Micropolitan Statistical Area.

Louisa County was formed on December 7, 1836, as a part of Wisconsin Territory.

[5] Louisa County became a part of Iowa Territory upon its formation on July 4, 1838.

[15] As of the census[16] of 2000, there were 12,183 people, 4,519 households, and 3,316 families residing in the county.

There were 5,133 housing units at an average density of 13 per square mile (5.0/km2).

22.50% of all households were made up of individuals, and 10.40% had someone living alone who was 65 years of age or older.

The population ranking of the following table is based on the 2010 census of Louisa County.