La Paz County (Spanish: Condado de La Paz) is the 15th county in the U.S. state of Arizona, located in the western part of the state.

[2] 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.

Under the revised Arizona laws, a county shall not be formed or divided by county initiative unless each proposed county would have all of the following characteristics: (1) at least three-fourths of one percent of the total state assessed valuation and at least the statewide per capita assessed valuation; (2) a population of at least three-fourths of one percent of the total state population according to the most recent United States decennial census; (3) at least one hundred square miles of privately owned land; (4) common boundaries with either (a) at least three other existing or proposed counties; or (b) at least two other existing or proposed counties and the state boundary.

[6] The Colorado River Indian Reservation is located in the western portion of the county.

Part of the reservation extends westward into San Bernardino and Riverside counties in California.

La Paz County hosts a variety of flora and fauna.

[8] The endangered California Fan Palm, Washingtonia filifera grows in a few spots in the county.

26.6% of households were made up of individuals, and 12.9% had someone living alone who was 65 years of age or older.

[18] Past sheriffs are: La Paz County is entirely within Arizona's 9th congressional district, which is currently represented by Republican Paul Gosar.

Avi Suquilla Airport (FAA LID: P20) is a public use airport located one nautical mile (1.9 km) east of the central business district of Parker, Arizona.

Colorado River Indian Reservation The population ranking of the following table is based on the 2020 census of La Paz County.