PHOENIX, a city of Arizona, the capital of the State and the county-seat of Maricopa co. It is on the Maricopa and Phoenix and the Santa Fé, Prescott, and Phoenix railroads. It is the site of the Agricultural Experiment Station. Among its important buildings are the capitol, Federal Building, city hall, court house and handsome school buildings. The city has important commercial interests and has an extensive trade in live stock, grain, fruits, hay, honey and olives. Pop. (1910) 11,134; (1920) 29,053.