Sétif is the capital city of the Sétif Province and the 5th most populous city of Algeria, with an estimated population of 410,000 residents in 2015 …Sétif is the capital city of the Sétif Province and the 5th most populous city of Algeria, with an estimated population of 410,000 residents in 2015 in an area of more than 127 km². It is one of the most important cities of eastern Algeria and the country as a whole, since it is considered the trade capital of the country and an industrial pole with 3 industrial zones within the borders of the city.