Valdez is a city in the Chugach Census Area in the U.S. state of Alaska. According to the 2020 US Census, the population of the city is 3,985…Valdez is a city in the Chugach Census Area in the U.S. state of Alaska. According to the 2020 US Census, the population of the city is 3,985, up from 3,976 in 2010. It is the third most populated city in Alaska's Unorganized Borough.