Volcano (formerly, Soldier's Gulch and The Volcano) is an unincorporated community in Amador County, California. It lies at an elevation of 2070 feet (631 m). The current population is approximately 85. It is located at , just north of Pine Grove. The town is registered as California Historical Landmark #29. The community is in ZIP code 95689 and area code 209.
The town is named for its setting in a bowl-shaped valley which early miners thought was caused by a volcano. The early morning fog rising from the valley floor only reinforced that belief. The spot was discovered in 1848 by Colonel Stevenson's men, who mined Soldiers Gulch in 1849. In 1851 a post office was established and by April 1852 there were 300 houses. By 1853 the flats and gulches swarmed with men, and there were 11 stores, 6 hotels, 3 bakeries, and 3 saloons. Hydraulic mining operations, begun in 1855, brought thousands of fortune seekers to form a town of 17 hotels, a library, a theater, and courts of quick justice. During the Civil War, Volcano's gold served the Union — Volcano Blues smuggled the cannon "Old Abe" to intimidate rebel sympathizers. The cannon was cast by Cyrus Alger & Co. in Boston in 1837 and is the first of two 6-pounders made on the same day to be stamped with serial number 4. The cannon was never fired. The other cannon still survives at Shiloh Battlefield and is called "Shiloh Sam". Abe is the only cannon of that age in the U.S. still on a nineteenth century wooden carriage, and has had an interesting history all on its own.
Volcano almost became the county seat in 1854 and again in 1857, but the newspaper closed in 1857 and afterwards, the town began to decline.
Community theater, first established in 1854, continues in the town through the efforts of the Volcano Theater Company. The company conducts a full season each year, performing in both the 35-seat Cobblestone Theater and in the larger outdoor Volcano Amphitheater.
In the state legislature Volcano is located in the 1st Senate District, represented by Republican Dave Cox, and in the 10th Assembly District, represented by Democrat Alyson Huber. Federally, Volcano is located in California's 3rd congressional district, which has a Cook PVI of R +7 and is represented by Republican Dan Lungren.