Sacramento is the capital of the U.S. state of California and the county seat of Sacramento County. Located along the Sacramento River and just south of the American River's confluence in California's expansive Central Valley, it is the seventh most populous city in California with a 2007 estimated population of 467,343. Sacramento is the core cultural and economic center of its four-county metropolitan area (El Dorado, Placer, Sacramento, and Yolo counties) with a combined population of 2,103,956. The Sacramento Metropolitan Area is the largest in the Central Valley, and is the fourth-largest in California, behind the Greater Los Angeles Area, the San Francisco Bay Area, and the San Diego area. Greater Sacramento has been cited as one of the five "most livable" regions in America, and the city was cited by Time magazine as America's most integrated.

Sacramento became a city due to the efforts of John Sutter, a Swiss immigrant, and James W. Marshall. Sacramento grew faster due to the protection of Sutter's Fort, which was established by Sutter in 1839. During the California Gold Rush, Sacramento was a major distribution point, a commercial and agricultural center, and a terminus for wagon trains, stagecoaches, riverboats, the telegraph, the Pony Express, and the First Transcontinental Railroad.

Typical of California informality, Sacramento is referred to by many nicknames. The most common names are Sac, SacTown, and The Capitol.

California State University, Sacramento, more commonly known as Sacramento State or Sac State, is the major local university. It is one of the twenty-three campuses of the California State University system. In addition, the University of California Davis is located in nearby Davis, just west of the capital.