Petersburg Borough is a borough in the U.S. state of Alaska. According to the 2020 census, the population was 3,398.^[2] The borough seat is Petersburg.^[3]

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Petersburg Borough
Borough
Five Finger Islands Light
Location within the U.S. state of Alaska
Alaska's location within the U.S.
Coordinates: 56°48′16″N 132°56′31″W
Country	United States
State	Alaska
Incorporated	January 3, 2013[1]
Named for	Petersburg
Seat	Petersburg
Largest CDP	Petersburg
Area
• Total	3,829 sq mi (9,920 km2)
Population  (2020)
• Total	3,360
• Density	0.88/sq mi (0.34/km2)
Time zone	UTC−9 (Alaska)
• Summer (DST)	UTC−8 (ADT)
Congressional district	At-large
Website	www.petersburgak.gov

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When the borough was incorporated in 2013, it took area from the Hoonah-Angoon Census Area and the former Petersburg Census Area. The remaining portion of Petersburg Census Area (including Kake) was added to Prince of Wales-Hyder Census Area. Petersburg Census Area was created in 2008 from the remaining portion of Wrangell-Petersburg Census Area upon the incorporation of the City and Borough of Wrangell.^[4]

Located in central Southeast Alaska, the Petersburg Borough encompasses approximately 3,829 square miles (2,921 square miles of land, 908 square miles of water).

Petersburg is strongly Republican, having last been carried by a Democrat in 1968.

As of the 2020 census, there were 3,398 people living in the borough. The population density was 0.89 per square mile (0.34/km²). There were 1,718 housing units. The racial makeup of the borough was 2,870 White, 92 Black or African American, 483 Native American, 209 Asian, 58 Pacific Islander, and 206 from other races. 164 of the population were Hispanic or Latino of any race.^[2]

• List of boroughs in Alaska