KNST (790 AM) is a commercial radio station in Tucson, Arizona, airing a news/talk radio format. The station is owned by iHeartMedia and serves Greater Tucson, including the suburbs of Marana, Oro Valley, Green Valley, Sahuarita, Sierra Vista, and Vail. KNST's studios and offices are located north of Downtown Tucson along Oracle Road, while the transmitter site is in West Tucson, off North Silverbell Road.