Warren County is a county in the U.S. state of Indiana. It lies in the western part of the state between the Illinois state line and the Wabash River. According to the 2020 census, it had a population of 8,440. Its county seat is Williamsport.
Before the arrival of non-indigenous settlers in the early 19th century, the area was inhabited by several Native American tribes. The county was officially established in 1827 and was the 55th county to be formed in Indiana.
It is one of the most rural counties in the state, with the third-smallest population and the lowest population density at about . The county has four incorporated towns with a total population of about 3,100, as well as many small unincorporated communities. The county is divided into 12 townships which provide local services.
Much of the land in the county is given over to agriculture, especially on the open prairie in the northern and western parts; the county's farmland is among the most productive in the state.
History
In the centuries before the arrival of European settlers, the area that became Warren County was on the boundary between the Miami and Kickapoo tribes. By the late 18th century, many Miami had moved further south; most of Indiana north of the Wabash was then occupied by the Potawatomi people. The first non-indigenous settler in the area was probably Zachariah Cicott, a French-Canadian who first traded with the Kickapoo and Potawatomi people around 1802. When General William Henry Harrison took an army from Vincennes to the Battle of Tippecanoe in late 1811, Cicott served as a scout; the trail taken by Harrison's army passed through the area that later became Warren County on its way to and from the battle site in Tippecanoe County. Following the War of 1812, Cicott resumed his trading on the Wabash; the state of Indiana was established in 1816, and Cicott built a log house in 1817 at the location where he later founded the town of Independence. Other settlers came to the area, but probably not until around 1822.
The county was established on March 1, 1827, by the Indiana General Assembly. It was named for Joseph Warren, who was killed in 1775 at the Battle of Bunker Hill, in which he fought as a private because his commission as a general had not yet taken effect. The short-lived town of Warrenton was the original Warren County seat, chosen by commissioners in March 1828; the next year an act was passed calling for the seat to be relocated, and in June 1829 it was moved to Williamsport.|group="n" in 1872, it was replaced with a new building that cost $48,000.