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 "Sitka, Alaska"): In terms of land area, it is the largest city-borough in the U.S., with a land area of 2,870.3 sqmi and a total area (including water area) of 4,811.4 sqmi ; however, it is the smallest of Alaska's boroughs.
Relevant evidence: No