Warrick County is a county located in the U.S. state of Indiana. As of 2010, the population was 59,689. The county seat is Boonville. It was organized in 1813 and was named for Captain Jacob Warrick, an Indiana militia company commander killed in the Battle of Tippecanoe in 1811. It is one of the ten fastest growing counties in Indiana.
Warrick County was formed by statute, March 9, 1813, effective April 1, 1813. Knox County was affected by this formation. Warrick County boundaries began at the mouth of the Wabash River; then up the Wabash River with the meanders thereof to the mouth of the White River; then up the White River with the meanders thereof to the Forks of the White River; then up White River East Fork to where the line between Sections 20 and 29, Township 1 North, Range 4 West, strikes the same; then with that line to the then Gibson County line; then with that line dividing Gibson and Knox Counties to the Ohio River; then down the Ohio River, to the place of beginning. The same was divided into two separate and distinct counties, by a line beginning on the Wabash River, known as Rector's Base Line (was surveyed by William Rector on the line between Townships 4 South and 5 South, from New Harmony, Posey County, and Alton, Crawford County, Indiana), and with that line east until it intersects the then Gibson County line and that tract of land falling within the southern division thereof was Warrick County.
Note: The Gibson-Warrick county boundary differed slightly in 1850 from its alignment in 1830-40 and 1860-1990.