The county seat of Yuma County, Arizona, is Yuma. The county population on July 1, 1999, was 135,614, an increase of 28,719 over the 1990 census.
In 1540, just 48 years after Columbus discovered the New World, Hernando de Alarcon visited the site of what is now the current City of Yuma. He was the first European to visit the area and to recognize the best natural crossing of the Colorado River. For many years, Yuma served as the gateway to the territory of California, which brought thousands from around the world in search of gold. In 1870, the Southern Pacific Railroad bridged the river. Yuma became a hub for the railroad and was selected as the county seat in 1864.
For information on county government, contact the National Association of Counties Web site.
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