Gümüşhacıköy is located in the westernmost district of Amasya Province of Turkey, 20 km from the larger town of Merzifon. It covers an area of 653 km², and the population (2010 census) is 24,806 of which 14,525 live in the town of Gümüşhacıköy, with the remainder spread throughout the surrounding mountainous countryside.