Coordinates: 40°16′34″N 123°38′11″W / 40.27611°N 123.63639°W / 40.27611; -123.63639
Blocksburg (formerly, Larrabee, Blocksburgh, Blockburger's and Powellville) is an unincorporated community in Humboldt County, California. It is located 15 miles (24 km) east-southeast of Weott, at an elevation of 1,594 feet (486 m). The ZIP Code is 95514.
The Blocksburgh post office opened in 1877. The name was changed to Blocksburg in 1893, and was named for Benjamin Blockburger, a local merchant.