Map - Vermillion County, Indiana (Vermillion County)

Vermillion County lies in the western part of the U.S. state of Indiana between the Illinois border and the Wabash River. As of the 2010 census, the population was 16,212. The county seat is Newport. It was officially established in 1824 and was the fiftieth Indiana county created. Vermillion County is included in the Terre Haute, Indiana, Metropolitan Statistical Area. The county contains seven incorporated towns with a total population of about 9,900. as well as several unincorporated communities; it is also divided into five townships which provide local services. An interstate highway, two U.S. routes, and five state roads cross the county, as does a major railroad line.

The first settlers in the area arrived in 1816, the same year that the state of Indiana was established. Vigo County was formed in 1818 and included the area that later became Parke and Vermillion counties. In 1821, Parke County was formed, and on January 2, 1824, the Indiana General Assembly created Vermillion County out of Parke County; the act took effect on February 1. The county seat was established at Newport later that year.

The county was named for the southbound Vermilion River, which flows nearby. The name is spelled in the French/Commonwealth English style with a double letter "l", in contrast to the American English spelling of the adjacent Vermilion County, Illinois. This is one of only a few cases in the United States in which a county borders a county with the same name in another state.

The first courthouse was a frame building. The contract was awarded in June 1824 for $345 and was to be completed by the following November; it was used for county business until a brick building could be constructed. The brick courthouse was contracted in 1831; the completed building was used until January 29, 1844, when the building caught fire. It was repaired and served until 1868 when a third courthouse was built at a cost of $30,000; a west wing was added in 1903 at a cost of $28,000. That building was struck by lightning early on the morning of May 27, 1923, and was largely destroyed by fire. Construction on the fourth (and current) courthouse began that same year; Halbert Fillinger and John Bayard were the architects. The stone building was constructed by Jasper Good of Columbus at a cost of $358,707, and the new courthouse was dedicated on June 11, 1925.

The Newport Hill Climb was first held in 1909. The event was started and stopped several times over the years, but the Newport Lions Club now runs the Newport Antique Auto Hill Climb; it has been held continuously since the 1960s and involves several hundred cars each year.

On January 26, 2017, the wooden grandstand at the Vermillion County Fairgrounds was destroyed by a massive fire. The wooden grandstand was built in 1933 as a WPA work project, and was the oldest wooden grandstand in Indiana. The Cayuga Fire Department said that the cause of the fire is suspicious.