Villarcayo de Merindad de Castilla la Vieja (Spanish pronunciation: [biʎaɾˈkaʝo ðe meɾinˈdað ðe kasˈtiʎa la ˈβjexa]) is a municipality located in the province of Burgos, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 4,031 inhabitants.
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