An interactive map traces the locations of Bay Area technology workplaces from the 1960s onward, letting users move through time, search for companies, and zoom in on neighborhoods. Its collection includes 395 employers, with sources linked to recorded locations, and a separate view focuses on employment in San Francisco. The project is intended to show how the region’s tech geography changed over time, and it highlights a striking pattern: San Francisco appears to have had few tech companies until the 2010s, when the city became a more visible center of the industry.
The map’s scope and limits matter when interpreting that pattern. It includes companies that had more than 1,000 employees worldwide in at least one documented year; that is a company-wide threshold, not a count of workers at any particular office. Records distinguish confirmed presence from inferred presence, and information before 1995 is especially incomplete. Consequently, an absent company or location on the map does not prove that no workplace existed or that one had closed. The project invites readers to contribute historical directories, dated business addresses, and other evidence that could fill gaps, making the map both a visualization of tech’s changing footprint and an evolving research resource.
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