Question: What was the 2010 census population of this united city-borough located on Baranof Island, from which the government of what was then the District of Alaska was moved in 1906?
Sentence (from "Juneau, Alaska"): It is a unified municipality located on the Gastineau Channel in the Alaskan panhandle, and it is the second largest city in the United States by area.
Relevant evidence: No