Castro is a municipality in the state of Paraná in the Southern Region of Brazil. The main road running through the town is the PR-151 road. Castrolanda is a colony that was founded by Dutch immigrants between 1951 and 1954 and the town includes a windmill. Its economy is based on agricultural production and dairy farming which is one of the most important in this region that is considered the largest dairy in Brazil due to their genetic quality. It has a considerable production of grain, mostly soy and beans. Also having one of the largest agricultural co-operatives in Brazil, which bears the name of the colony.
Castro has a population of over 71,809 people.