Petersburg (also, Petersburgh and Greenhorn) is a former settlement in Kern County, California.

[1] It was located on Greenhorn Creek 4.5 miles (7.2 km) west-northwest of Miracle Hot Springs,[2] at an elevation of 4731 feet (1442 m).

[1] A post office operated at Petersburgh from 1858 to 1863.

[2] The place was named for Peter Gardett, early merchant there.

This Kern County, California-related article is a stub.