La Paz County was created Jan 1, 1983, when Yuma County residents voted to split their county into two sections. It is the 15th of Arizona's 15 counties, with Parker the county seat.
La Paz, which means "the peace" in Spanish, has historic significance as the name of a boom town on the Colorado River. The Colorado River town of La Paz was founded in 1862, after the discovery of rich gold deposits nearby. By 1863, there were probably 5,000 men working in the gold mines, making La Paz one of the largest settlements in what was to become the Arizona Territory. The decline of La Paz was caused by two factors - the mines dried up and the Colorado River changed its course in 1870, leaving the town "high and dry."
La Paz County encompasses 4,518 square miles and has 30 square miles of water. It is the third smallest of Arizona's counties and has the lowest population density with slightly more than four persons per square mile. The U.S. Bureau of Land Management controls 58.3 percent of the land; the state of Arizona, 8.8 percent; other public lands, 19.5 percent; and 5.3 percent of the land is owned privately or by corporations. The Colorado River Indian Tribe owns 8.1 percent of the land. All of La Paz County is an Enterprise Zone.