Holbrook is a city located in Navajo County, Arizona, United States. It has a population of approximately 5,000 people. Holbrook is known for its historical significance, as it was originally a railroad town and served as a trading post for Navajo and Hopi people. The city is also home to the Petrified Forest National Park, which attracts many tourists due to its unique geological features and petrified wood. Additionally, Holbrook has a thriving Route 66 heritage and is a popular stop for those traveling along the historic highway.