Pike, formerly Pike City is a census-designated place in Sierra County, California, United States. Pike is 8.5 miles (13.7 km) west-southwest of Alleghany. The community was named after Pike County, Missouri. The post office in Pike opened as Pike City Post Office in 1877, became Pike Post Office in 1895, and closed in 1954. The population was 159 at the 2020 census.