Researcher T. Udell has compiled decades of employment data to map major company facilities across Northern California using historical records and federal economic metrics. The project traces corporate footprints by plotting facilities alongside government labor statistics to illustrate shifting regional employment patterns through 2026. This comprehensive mapping effort offers economic historians a detailed view of corporate development across several critical periods of regional expansion.
Key points
Map markers depict physical facility sites or approximate city presence rather than repre…: Map markers depict physical facility sites or approximate city presence rather than representing exact local employee headcounts.
Historical data gaps are accounted for by labeling unverified observations as last-known…: Historical data gaps are accounted for by labeling unverified observations as last-known locations and short gaps as estimated presence.
A 2022 industry-code revision limits direct statistical comparisons for San Francisco Cou…: A 2022 industry-code revision limits direct statistical comparisons for San Francisco County high-tech employment across that timeline boundary.
Sources checked by our analysis pipeline: 1
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…
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