South San Francisco Hillside Sign
Every pilot on approach to San Francisco International Airport has seen it: giant white letters on a brown hillside spelling out SOUTH SAN FRANCISCO THE INDUSTRIAL CITY. The sign is so familiar to Bay Area residents that it registers as permanent landscape rather than human artifact. But someone built it, letter by letter, in the 1920s -- a booster's declaration that this was not San Francisco proper but its working-class neighbor to the south, a place that earned its identity from meatpacking plants, steel foundries, and the industrial economy that the larger city depended on but preferred to keep at arm's length.
The Letters on the Hill
The sign sits on the eastern slope of Sign Hill, overlooking the city of South San Francisco in San Mateo County. The letters were constructed in the 1920s, when civic boosters wanted to distinguish their industrial town from its famous neighbor. South San Francisco had been incorporated in 1908 with an economy built on the Western Meat Company and the Swift and Armour packing houses that processed livestock from the surrounding ranches. The sign was an advertisement, a statement of identity, and a challenge: while San Francisco cultivated tourism and culture, South San Francisco built things. The letters were listed on the National Register of Historic Places in 1996.
Sign Hill Park
The sign is now the centerpiece of Sign Hill Park, a 58-acre city park that preserves the hillside as open space. The park offers hiking trails through native coastal scrub and grassland, with views of San Francisco Bay, the airport, and the surrounding Peninsula cities. The sign itself is maintained by the city, its white letters periodically repainted to keep them visible from the highway and the air. What was once a piece of industrial boosterism has become a beloved landmark, cherished precisely for its lack of sophistication. In an era of corporate naming rights and digital billboards, concrete letters on a hill feel refreshingly honest.
The Industrial City Evolves
South San Francisco's economy has transformed dramatically since the sign was built. The meatpacking plants are long gone, replaced by biotechnology companies that cluster along the corridor between South San Francisco and Brisbane. Genentech, one of the founding companies of the biotech industry, established its headquarters here in 1976. The sign's claim -- THE INDUSTRIAL CITY -- has become both anachronistic and accidentally prophetic, since biotechnology is an industry even if it does not look like the smokestacks the sign's creators imagined. The letters endure, visible from every angle of approach, a reminder that this town has always defined itself by what it makes.
From the Air
The South San Francisco hillside sign is at 37.66N, -122.42W, on the eastern slope of Sign Hill. It is impossible to miss on approach to KSFO from the north or northwest -- the white letters are visible from several miles. The sign faces east, toward the Bay and the airport. KSFO is 3nm to the southeast.