Data Centers in California
313 Facilities Tracked

142 data center operators maintain facilities in California, led by Lumen (27). Beyond the headline leader, Equinix (25) and Digital Realty (17) maintain meaningful state-level presence and run distinct facility footprints by city and market segment. Counts on each operator card reflect facilities placed at a confirmed address inside the state, not aggregate national footprint, so in-state readers see only the operator's resident facility presence. Across the state, operator footprints span 68 cities, ranging from large single-tenant builds and carrier-neutral colocation to enterprise build-to-suit sites, with the largest concentrations in the cities listed below. Operator counts here measure each company's full in-state footprint; city totals elsewhere on the page count every operator's facilities inside that city, so the two metrics use different denominators by design.

The Silicon Valley region (San Jose-Sunnyvale-Santa Clara MSA + San Francisco-Oakland-Berkeley MSA (combined SJ-SF-Oakland CSA)) clusters 109 of California's data center facilities across 3 cities, anchoring the state's hyperscale and colocation footprint. The metro concentrates the bulk of the state's data center capacity, drawing operator demand from fiber convergence, power availability, and regional siting incentives that compound across each major hyperscale and colocation deployment. Because hyperscale operators plan capacity at the metro level rather than by city or state line, the MSA view often reflects siting and expansion decisions more accurately than any single municipal boundary. Each metro hub aggregates facility data across multiple cities within a single MSA.

Data center facilities in California are distributed across 68 cities. Santa Clara has the most verified facilities in the state (60), followed by San Jose (37) and Los Angeles (34), which carry the next-largest counts. Per-city facility counts and operator breakdowns appear in the city table below, with each market's verified facility list, operator attribution, and source-tier data accessible in the directory section. Every city-level count shown here is derived from the same verified, de-duplicated facility records as the statewide total, so the figures reconcile from the state number down to each individual market. A reader can cite any single city's count and trace it back to the published source list without it conflicting with the California total.

California's data center market does not operate in isolation. Adjacent states including Arizona, Nevada, Oregon share long-haul fiber routes, regional power interconnects, and multi-state operator portfolios with the facilities tracked across California, so capacity and siting decisions in one market routinely shape the next. The related-state directories below let researchers benchmark facility density, operator concentration, and metro distribution against these neighboring markets, and trace how the operators with the heaviest California presence extend their footprints across the surrounding region. Comparing California against its neighbors this way also shows at a glance whether the state anchors its regional data center cluster or ranks behind a larger adjacent market.

Common questions about data centers in California, answered using verified data from ITAMG's multi-source directory of 313 facilities.

Every facility on this page has been compiled from the directory's 15 source datasets, including operator filings, regulatory disclosures, and industry databases, and cross-checked where more than one source reports it. ITAMG matches records by name, address, geographic coordinates, and operator identity, then collapses duplicates into a single canonical entry. Where a facility hosts multiple providers, the Index reports the facility operator, which may differ from a provider named in the facility's name. A facility appears here only when two conditions hold. First, the building must be locatable on a map by either coordinates or a verified street address. Second, the record must describe an actual data center, not a colocation reseller, a telco hub, or a paper-only mention in a financial filing. Records that fail either test are excluded.

Operator names and trademarks referenced on this page are property of their respective owners. ITAMG is an independent IT asset disposition company and is not affiliated with the data center operators listed.