Petersburg (Tlingit: Gantiyaakw Séedi "Steamboat Channel") is a census-designated place (CDP) in Petersburg Borough, Alaska, United States. The population was 2,948 at the 2010 census, down from 3,224 in 2000.
The borough encompasses Petersburg and Kupreanof, plus mostly uninhabited areas stretching to the Canadian–American border and the southern boundary of the City and Borough of Juneau. While the city of Petersburg ceased to exist as a separate administrative entity (the borough assembly created a service area to assume operation of the former city's services), the tiny city of Kupreanof remains separate within the borough.
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