Some sources state that the village was first mentioned in a Latin document of Diocese of Wrocław called Liber fundationis episcopatus Vratislaviensis from around 1305 as item in Bertholdi villa debent esse XLV mansi, however it is unlikely and disputed. Surely it was later mentioned in a written document in 1447 as Darkow. Politically it belonged initially to the Duchy of Teschen, a fee of the Kingdom of Bohemia, which after 1526 became part of the Habsburg Monarchy. In 1573 it was sold as one of a dozen villages and the town of Freistadt and formed a state country split from the Duchy of Teschen. After the Revolutions of 1848 in the Austrian Empire a modern municipal division was introduced in the re-established Austrian Silesia. The village as a municipality was subscribed at first to the political district of Teschen and the legal district of Freistadt, which in 1868 became an independent political district. According to the censuses conducted in 1880, 1890, 1900 and 1910 the population of the municipality grew from 614 in 1880 to 2,305 in 1910 with a majority being native Polish-speakers accompanied by German-speaking and Czech-speaking people. In terms of religion in 1910 the majority were Roman Catholics, followed by Protestants and Jews. The village was also traditionally inhabited by Silesian Lachs, speaking Cieszyn Silesian dialect. After World War I, the fall of Austria-Hungary, the Polish–Czechoslovak War and the division of Cieszyn Silesia in 1920, the village became a part of Czechoslovakia. Following the Munich Agreement, in October 1938 together with the Zaolzie region it was annexed by Poland, administratively organised in Frysztat County of Silesian Voivodeship. The village was then annexed by Nazi Germanyat the beginning of World War II. After the war it was restored to Czechoslovakia. The village is well known for its Darkov Spa facilities, established in 1866 which treats various diseases, mostly diseases of locomotive organs, conditions after accidents and operations etc. It has one of the best iodine-bromine waters in Central Europe. Prominent landmark is a Darkov bridge on the Olza built in 1922-1925, located just near the spa. In 1991 it was inscribed on the state register of technical landmarks. It was renovated in the 2000s. Darkov together with neighboring villages suffered of under-mining caused by nearby coal mines. This affected the character of the village as many inhabitants relocated to nearby villages and towns, thus seriously depopulating the village.
