Olmillos de Castro is a municipality located in the province of Zamora, Castile and León, Spain. According to the 2004 census (INE), the municipality had a population of 378 inhabitants.
Town hall Olmillos de Castro is home to the town hall of 4 towns, because Olmillos is the central point between the 4 towns. The towns are the following: San Martín de Tábara (72 inhabitants, INE 2020). Olmillos de Castro (63 inhabitants, INE 2020). Marquiz de Alba (59 inhabitants, INE 2020). Navianos de Alba (18 inhabitants, INE 2020).
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