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Yuma County, Arizona. Yuma County is a county in the southwestern corner of the U.S. state of Arizona. As of the 2010 census, its population was 195,751. The county seat is Yuma. Yuma County comprises the Yuma, AZ Metropolitan Statistical Area. The county borders the Colorado River to the southwest, with three other states across the river: California of the United States and the Mexican state of Baja California to the west, and Sonora, Mexico, 60 miles to the south.