Living Maps: Bay Area tech since 1960s

A historical record of Bay Area workplaces for employers with more than 1,000 employees worldwide in at least one documented year. This is the company’s total workforce, not staff at each location. By T. Udell · Research updated November 5, 2026 1960198020002025 Locations & employer presence · 1970 No matching location evidence for this selection. This does not establish that companies closed. Loading locations…Modern geography · US Census 2024 · Drag to pan Marker color / typeHQ HeadquartersBR BranchOF OfficeRD Research / developmentMF Manufacturing? Type not established City presence Estimated presence Last-known, unverified Company directory About the bubbles and this research sample Who is included: employers with more than 1,000 worldwide employees in at least one sourced year and a documented Bay Area workplace. All records includes unresolved and outside-tech cases; use the scope and industry filters to narrow the sample. Reading the map: bubbles show workplaces or approximate city presence, not employee totals. Hollow bubbles are city-level records; cluster numbers count distinct employers. Click a bubble for dated evidence and sources. The dashed rectangle marks the study extent, not complete coverage. Gaps are not closures: supported presence intervals remain visible; short carry-forwards are labeled estimated. Older observations appear only with “Show last-known locations,” and remain unverified. Confirmed closures or departures suppress the affected locations. All recorded years combines observations from different dates. Navigation: drag to pan; use +/− or Ctrl+scroll to zoom. Keyboard: arrows, +/− and Home. The timeline advances in five-year steps; Latest shows 2026. Roads and boundaries are US Census 2024 geography, not historical reconstructions. City positions remain approximate at every zoom. San Francisco · government employment statistics San Francisco tech employment share High-tech industry jobs as a percentage of all QCEW-covered jobs in San Francisco County. Census's high-tech industry definition, applied to BLS county data; this is a separate calculation from the employer map. ▲ Published minimum: the true share may be higher. ● Complete published basket. Lines connect annual published values within each industry definition, not estimates of missing employment. Gaps and definition changes break the line. 1960–1989 has no comparable series here; 2026 has no full-year observation. The 2022 industry-code change alters the basket, so values across that boundary are not directly comparable. Missing industry cells can change the published minimum without employment actually changing. Definition, industry codes and sources Jobs are counted at workplaces, not by where workers live. QCEW excludes many self-employed workers and is not a count of all people working. San Francisco County is the fixed statistical unit. No employer-size cutoff applies.