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Kaya Union (Bengali: কয়া ইউনিয়ন) is a union parishad situated at Kumarkhali Upazila, in Kushtia District, Khulna Division of Bangladesh. The union has an area of 18.64 square kilometres (7.20 sq mi) and as of 2001 had a population of 30,988. There are 14 villages and 12 mouzas in the union.