Phoenix was a city located in the state of Arizona, in the nation-state of the United States of America.
In 1957, Jack's father had moved to Phoenix according to his ex-wife Maggie's last information. (ENT: "Carbon Creek")
When the USS Voyager was transported from 2373 to 1996, a shuttle with Chakotay and B'Elanna Torres on board crashed about thirty kilometers northeast of Phoenix. (VOY: "Future's End, Part II")