The name of the county is the Spanish word for the peace, and is taken from the early settlement (now ghost town) of La Paz along the Colorado River.
Northern Yuma County Union High School was the high school for northern Yuma County, Arizona (now La Paz County).
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Ehrenberg Wash (also known as Cinnabar Wash) is a stream located in La Paz County, Arizona, in the census-designated place of Ehrenberg.