1860s in California

America's first transcontinental railroad (known originally as the "Pacific Railroad" and later as the "Overland Route") was a 1,911-mile (3,075 km) continuous railroad line built between 1863 and 1869 that connected the existing eastern U.S. rail network at Council Bluffs, Iowa, with the Pacific coast at the Oakland Long Wharf on San Francisco Bay. The rail line was built by three private companies over public lands provided by extensive U.S. land grants. Building was financed by both state and U.S. government subsidy bonds as well as by company-issued mortgage bonds. The Western Pacific Railroad Company built 132 miles (212 km) of track from the road's western terminus at Alameda/Oakland to Sacramento, California. The Central Pacific Railroad Company of California (CPRR) constructed 690 miles (1,110 km) east from Sacramento to Promontory Summit, Utah Territory. The Union Pacific Railroad (UPRR) built 1,085 miles (1,746 km) from the road's eastern terminus at the Missouri River settlements of Council Bluffs and Omaha, Nebraska, westward to Promontory Summit.

The Sebastian Indian Reservation (1853-1864), more commonly known as the Tejon Indian Reservation, was formerly at the southwestern corner of the San Joaquin Valley in the Tehachapi Mountains, in southern central California.

The Central Pacific Railroad (CPRR) was a rail company chartered by U.S. Congress in 1862 to build a railroad eastwards from Sacramento, California, to complete most of the western part of the "First transcontinental railroad" in North America. Incorporated in 1861, CPRR ceased independent operations in 1885 when the railroad was leased to the Southern Pacific Railroad. Its assets were formally merged into Southern Pacific in 1959.

The Owens Valley War was fought between 1862 and 1863 by the United States Army and American settlers against the Mono people and their Shoshone and Kawaiisu allies in the Owens Valley of California and the southwestern Nevada border region. The removal of a large number of the Owens River indigenous Californians to Fort Tejon in 1863 was considered the end of the war. Minor hostilities continued intermittently until 1867.

The Western Pacific Railroad (1862–1870) was formed in 1862 to build a railroad from Sacramento, California, to the San Francisco Bay, the westernmost portion of the First transcontinental railroad. After the completion of the railroad from Sacramento to Alameda Terminal on September 6, 1869, and then the Oakland Pier on November 8, 1869, which was the Pacific coast terminus of the transcontinental railroad, the Western Pacific Railroad was absorbed in 1870 into the Central Pacific Railroad.

Oak Grove Butterfield Stage Station is a stage station in the western foothills of the Laguna Mountains, in northern San Diego County, California. It is located on State Route 79, 13 miles (21 km) northwest of Warner Springs and Warner's Ranch. The station was built on the site of Camp Wright, an 1860s Civil War outpost.

The Central Overland California and Pike's Peak Express Company was a stagecoach line that operated in the American West in the early 1860s, but it is most well known as the parent company of the Pony Express. It was formed as a subsidiary of the freighting company Russell, Majors, and Waddell, after the latter two partners bought out Russell's stage line, the Leavenworth and Pikes Peak Express Company. The stage line had made its first journey from Westport, Missouri, to Denver on March 9, 1859.

The Central Overland California and Pike's Peak Express Company was a stagecoach line that operated in the American West in the early 1860s, but it is most well known as the parent company of the Pony Express. It was formed as a subsidiary of the freighting company Russell, Majors, and Waddell, after the latter two partners bought out Russell's stage line, the Leavenworth and Pikes Peak Express Company. The stage line had made its first journey from Westport, Missouri, to Denver on March 9, 1859.

The Los Angeles Common Council was the predecessor of the Los Angeles, California, City Council. It was formed in 1850 under state law, when the city had only 1,610 residents, and it existed until 1889, when the city had about 50,400 residents and a city charter was put into effect. It succeeded the council of the Ciudad de Los Angeles.

The Napa Valley Rail-Road Company was incorporated on March 2, 1864, as the Napa Valley Rail-Road Company, but it would subsequently be spelled as the Napa Valley Railroad Company (without the hyphen) in numerous newspapers and published documents. The company was formed with the goal to construct a railroad through the Napa Valley from the tidewaters at the ferry in Suscol to Calistoga. The railroad was completed to Calistoga in 1868 and then extended south from Suscol to Adelante in 1869. The railroad existed for only 5 years before it was sold to the California Pacific Railroad under foreclosure on June 9, 1869.