This project maps Bay Area technology employers from the 1960s through 2026, showing where qualifying companies had documented workplaces over time. Employers are included if they had more than 1,000 employees worldwide in at least one sourced year and a documented Bay Area location; the threshold applies to the whole company, not a particular office. Users can explore years and subregions, search employers, and filter by industry or how closely a company fits the technology scope. Map markers distinguish headquarters, branches, offices, research and development, and manufacturing where evidence supports those labels. They show locations or approximate city presence, not workforce size.
The map is a historical record rather than a complete census, and its limitations are central to interpreting it. Coverage before 1995 is especially difficult; gaps in evidence do not prove a company closed, some carried-forward locations are estimates, and older last-known locations are unverified. Approximate positions, overlapping sites, and differing observation dates also affect comparisons. A separate chart tracks high-tech jobs as a share of all QCEW-covered jobs in San Francisco County, using a Census industry definition applied to Bureau of Labor Statistics data. It excludes many self-employed workers, measures jobs where they are located, and has no comparable series for 1960-1989. Missing data and the 2022 industry-code change make some values minimums or non-comparable, so apparent shifts do not always indicate actual employment change.
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