The capital of Arizona is PHOENIX, a seven-letter word. PHOENIX is the sixth most populous city in the United States and the most populous state capital in the country. It is located in the south-central part of the state and is known for its desert climate, hot summers, and mild winters. PHOENIX is home to many cultural attractions, including the Heard Museum, the PHOENIX Art Museum, and the Arizona Science Center. It is also home to several professional sports teams, including the Arizona Diamondbacks, the PHOENIX Suns, and the Arizona Coyotes.