Presidio of San Francisco in the context of "City and County of San Francisco, California"

San Francisco, officially the City and County of San Francisco, is a commercial, financial, and cultural center of Northern California. With an estimated population of 827,526 residents as of 2024, San Francisco proper is the fourth-most populous city in the U.S. state of California and the 17th-most populous in the United States. Among U.S. cities proper with over 300,000 residents, San Francisco is ranked second by population density, first by per capita income, and sixth by aggregate income as of 2023. Depending on how its borders are defined, the broader San Francisco metropolitan area or San Francisco Bay Area is home to 4.6–9.2 million residents. In 2024, the U.S. Census Bureau reported an estimated population of 4,648,486 for the city's metropolitan statistical area (13th-largest in the U.S.) and 9,164,058 residents for the larger combined statistical area (5th-largest).

Prior to European settlement, the modern city proper was inhabited by the Yelamu Ohlone. On June 29, 1776, settlers from New Spain established the Presidio of San Francisco at the Golden Gate, and the Mission San Francisco de Asís a few miles away, both named for Francis of Assisi. The California gold rush of 1849 brought rapid growth, making it the largest city on the West Coast at the time. In 1856, San Francisco became a consolidated city-county. After three-quarters of the city was destroyed by the 1906 earthquake and fire, it was quickly rebuilt, hosting the Panama–Pacific International Exposition nine years later. In World War II, it was a major port of embarkation for naval service members shipping out to the Pacific Theater. After the war, the confluence of returning servicemen, significant immigration, liberalizing attitudes, the rise of the beatnik and hippie countercultures, the sexual revolution, opposition to U.S. involvement in the Vietnam War, and other factors led to the Summer of Love and the gay rights movement, cementing San Francisco as a center of liberal activism.

The Panama–Pacific International Exposition was a world's fair held in San Francisco, California, United States, from February 20 to December 4, 1915. Its stated purpose was to celebrate the completion of the Panama Canal, but it was widely seen in the city as an opportunity to showcase its recovery from the 1906 earthquake. The fair was constructed on a 636-acre (257-hectare) site along the northern shore, between the Presidio and Fort Mason, now known as the Marina District.

Industrial Light & Magic (ILM) is an American motion picture visual effects, computer animation and stereo conversion digital studio founded by George Lucas on May 26, 1975. It is a division of the film production company Lucasfilm, which Lucas founded, and was created when he began production on the original Star Wars, the fourth episode of the Skywalker Saga.

ILM originated in Van Nuys, California, then later moved to San Rafael in 1978, and since 2005 it has been based at the Letterman Digital Arts Center in the Presidio of San Francisco. In 2012, The Walt Disney Company acquired ILM as part of its purchase of Lucasfilm. As of 2024, Industrial Light & Magic has won 15 Academy Awards for Best Visual Effects.

The Golden Gate National Recreation Area (GGNRA) is a U.S. national recreation area protecting 82,116 acres (33,231 ha) of ecologically and historically significant landscapes surrounding the San Francisco Bay Area. Much of the park is land formerly used by the United States Army. GGNRA is managed by the National Park Service and is the second-most visited unit of the National Park system in the United States (ranking only under Blue Ridge Parkway), with more than 15.6 million visitors in 2022. It is also one of the largest urban parks in the world, with a size two-and-a-half times that of the consolidated city and county of San Francisco.

The park is not one continuous locale but rather a collection of areas that stretch from southern San Mateo County to northern Marin County and includes several areas of San Francisco mostly on the West Side of the city. The park is as diverse as it is expansive; it contains famous tourist attractions such as Muir Woods National Monument, Alcatraz, and the Presidio of San Francisco. The GGNRA is also home to over 3,000 plant and animal species, encompasses 59 miles (95 km) of bay and ocean shoreline and has military fortifications that span centuries of California history, from the Spanish conquistadors to Cold War-era Nike missile sites.