Castries Quarter is one of eleven Quarters on the Caribbean island nation of Saint Lucia. According to the 2012 census, the population of the Quarter was 80,573, having shown a slow but steady increase over the past ten years. The capital of Saint Lucia, the city of Castries, is located in this Quarter. During the Saint Lucia Jazz Festival, the city of Castries plays host to several stages.Castries is a port city.