The townsite of Vernon began when gold mines in the Seven Troughs area opened in 1905, and on September 21, 1906 a plat was accepted by the Humboldt County Commissioners. A post office began operation on October 31, 1906, and by mid 1907, Vernon was the most prosperous town in the district. During its peak, the population was about 600.

By 1913, the town's population had fallen to only 50, and on July 31, 1918, it lost its post office. Today, the only remnant of the once thriving town of Vernon are the ruins of the block jail.

Seven Troughs District
Seven TroughsMazuma
Tunnel CampVernon