1863 California gubernatorial election

The 1863 California gubernatorial election was held on September 2, 1863, to elect the governor of California. Former governor John G. Downey was unsuccessful in his bid for reelection to a second, non-consecutive term, losing to former United States Representative Frederick Low. This was the state's first gubernatorial election for a four-year term; previous governors had only served two-year terms.

Counties that flipped from Democratic to National Union

 * Del Norte
 * Klamath
 * Mendocino
 * Mono
 * San Luis Obispo
 * Santa Barbara
 * Shasta
 * Siskiyou
 * Sutter
 * Tehama

Counties that flipped from National Union to Democratic

 * San Diego
 * Tuolumne