Juliana — Sales & GTM expert
Slack's headquarters is at 500 Howard Street, San Francisco, CA 94105 — in the South of Market (SoMa) district, roughly six blocks from Salesforce Tower. Since Salesforce completed its $27.7 billion acquisition of Slack in July 2021, the company has operated as a distinct business unit while retaining its original San Francisco address. For anyone trying to reach Slack's team, verify vendor relationships, or identify companies in Slack's orbit for sales outreach, this directory covers everything you need.
- Slack HQ is at 500 Howard Street, San Francisco, CA 94105 (SoMa district).
- Slack has offices in at least 8 cities: San Francisco, New York, Denver, Dublin, London, Tokyo, Toronto, and Melbourne.
- Salesforce acquired Slack for $27.7 billion in 2021 but kept its headquarters and brand separate.
- Slack serves over 200,000 paying customers globally — each one a potential prospect for competing collaboration or communication tools.
- Office locations signal where Slack's enterprise sales, engineering, and support teams concentrate — useful context for competitive outreach.
Where is Slack headquartered?
Slack is headquartered at 500 Howard Street, San Francisco, California 94105. The address sits in SoMa (South of Market), the same neighborhood that houses many of San Francisco's largest tech employers. The building is a short walk from the Salesforce Transit Center and Salesforce Tower, which matters given Slack's parent company relationship.
Slack was founded in 2013 by Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov — originally as a side project while building a video game called Glitch. The company grew rapidly after its public launch in August 2013 and went public via a direct listing on the NYSE in June 2019 before being acquired by Salesforce two years later. Through all of that, the San Francisco headquarters has remained constant.
If you're mailing correspondence or looking for the registered agent address for Slack Technologies, LLC (the legal entity post-acquisition), 500 Howard Street remains the address of record with the State of California.
What are all of Slack's office locations worldwide?
Slack operates offices across North America, Europe, and Asia-Pacific. Below is the full directory of confirmed Slack office locations as of 2026.
North America
| City | Address | Function |
|---|---|---|
| San Francisco, CA (HQ) | 500 Howard Street, San Francisco, CA 94105 | Headquarters — Engineering, Product, Executive |
| New York, NY | 135 W 18th Street, New York, NY 10011 | Enterprise Sales, Marketing |
| Denver, CO | 1700 Lincoln Street, Denver, CO 80203 | Engineering, Customer Success |
| Toronto, ON | 111 Queen Street East, Toronto, ON M5C 1S2 | Engineering, Design |
Europe
| City | Address | Function |
|---|---|---|
| London, UK | One Kingdom Street, Paddington, London W2 6BD | EMEA Sales, Partnerships |
| Dublin, Ireland | Salesforce EMEA HQ, Salesforce Tower, Dublin D02 R6H7 | EMEA Operations, Support (shared Salesforce facility) |
Asia-Pacific
| City | Address | Function |
|---|---|---|
| Tokyo, Japan | Salesforce Tower Tokyo, 3-1 Marunouchi, Chiyoda, Tokyo 100-0005 | Japan Sales, Support |
| Melbourne, Australia | Salesforce Tower, 180 Lonsdale Street, Melbourne VIC 3000 | APAC Sales, Customer Success |
Note that Slack's international offices outside North America increasingly share facilities with Salesforce following the acquisition. The branding at these locations may reflect Salesforce rather than Slack specifically, but Slack teams operate from them.
What happened to Slack's offices after the Salesforce acquisition?
When Salesforce closed its acquisition of Slack in July 2021, it made a deliberate choice to keep Slack operating as a standalone product and brand rather than absorbing it into the core Salesforce platform. That decision extended to real estate: Slack's San Francisco headquarters at 500 Howard Street was not consolidated into Salesforce Tower.
"Slack will remain the place for work, and together we'll be able to do it in a whole new way — bringing together the right people, information, and tools to get work done."
— Bret Taylor, then President and COO, Salesforce, at the close of the Slack acquisition, July 2021
In practice, some back-office and support functions have migrated into Salesforce's facilities — particularly in Dublin and the Asia-Pacific region, where Salesforce had existing large offices and Slack did not. This is why the Tokyo and Melbourne entries above reflect Salesforce Tower addresses. However, the core product, engineering, and go-to-market teams continue to operate from Slack's own offices, with San Francisco as the center of gravity.
One meaningful operational change post-acquisition: Slack adopted a hybrid work policy that reduced the density of its owned real estate. Slack has publicly committed to distributed-first work, meaning a significant portion of its workforce operates remotely even when offices are available. This makes Slack's office footprint a floor, not a ceiling, on where their employees are actually located.
How many employees does Slack have and where are they based?
Slack employs approximately 2,500–3,000 people as of 2026, though exact headcount fluctuates with Salesforce's broader workforce decisions. Salesforce's January 2023 reduction of roughly 10% of its global workforce affected Slack teams proportionally, making pre-2023 figures unreliable as a current reference.
The concentration of headcount roughly mirrors the office footprint: San Francisco and New York hold the largest shares, followed by Denver and Toronto in North America. London is Slack's largest European presence. Given the distributed-first policy, a meaningful share of employees — estimates suggest 30–40% of product and engineering roles — are fully remote with no assigned office.
For sales prospectors, this distribution matters less than it might seem. The companies using Slack are distributed across every industry and geography. Slack's own headcount data is more relevant if you're trying to reach Slack as a prospect than if you're using Slack's customer base as a targeting list.
Why do Slack's office locations matter for B2B sales prospecting?
There are two reasons a B2B sales rep would look up Slack's office locations. The first is obvious: they're trying to reach someone at Slack directly. The second is more valuable: they're building a prospecting list of companies that use Slack — and want to understand the geographic and industry footprint of that customer base to prioritize outreach for a competing or complementary product.
Slack has over 200,000 paying customers globally, according to figures Slack reported before its acquisition. That base spans categories from enterprise financial services to early-stage SaaS startups. If you sell a competing team communication platform, an enterprise security tool, or a workflow automation product, Slack's customer list is one of the richest targeting pools available.
The traditional way to find those companies is slow — scraping job postings for mentions of Slack, manually reviewing LinkedIn profiles, or buying lists of uncertain accuracy. A faster approach is using a tool like Stealery — you search for Slack as the target, and it surfaces every company actively using it, filterable by size, location, and hiring signals. For SDRs trying to break into accounts already spending on collaboration tools, that's the starting point for a relevant conversation rather than a cold one.
Understanding where Slack's offices are also helps you understand where its enterprise sales team concentrates. If you're selling to companies in New York or London and want to know whether a prospect's Slack contract is likely managed locally or from San Francisco, the office footprint above gives you that context.
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