Petersburg James A. Johnson Airport is a state owned, public use airport located one nautical mile (2 km) southeast of the central business district of Petersburg, a city in the Petersburg Borough of the U.S. state of Alaska that has no road access to the outside world. Airline service is subsidized by the Essential Air Service program.

Petersburg is a census-designated place (CDP) in and essentially the borough seat of Petersburg Borough, Alaska, United States. The population was 3,043 at the 2020 census, up from 2,948 in 2010.