Costco Wholesale Corporation’s corporate headquarters is at 999 Lake Drive, Issaquah, WA 98027, United States. Its official pages also publish eight US regional offices and eleven international division entries. Below are the addresses, the differences between official sources, and a downloadable spreadsheet.

Sources checked September 10, 2026. Regional coverage labels are kept separate from the country where each office is physically located.

Costco headquarters address and mailing address

999 Lake Drive
Issaquah, WA 98027
United States

Both Costco’s investor contacts page and corporate-office help page give this street address. The corporate office phone number is 425-313-8100.

For corporate mail, the help page separately lists P.O. Box 34331, Seattle, WA 98124. A post office box is a mailing destination, not an office you can visit.

Why does another Costco page say 730 Lake Drive?

The vendor inquiries page lists 730 Lake Drive, Issaquah, WA 98027 in its corporate-office introduction. That differs from the investor and customer-service address. This guide uses 999 Lake Drive for headquarters and records 730 Lake Drive separately as a vendor-page listing. Confirm the intended destination with your Costco contact before sending time-sensitive documents or arranging a visit.

Costco international office addresses

Costco’s vendor directory publishes the following eleven international entries. These are division contact listings; the list does not establish that every location is a national headquarters.

Source: Costco vendor inquiries. Three details help interpret the list:

• Canada: Costco’s Canadian customer-service page also identifies the Ottawa address as the Canadian headquarters. Burnaby is listed separately for Western Canada.
• United Kingdom: the vendor directory shows WD2 8JS. The table uses WD25 8JS, supported by Costco UK and Companies House. The workbook retains a note about the discrepancy.
• Regional coverage: the UK entry also covers Iceland and Sweden; the Australia entry also covers New Zealand. Those labels do not create separate office addresses in each country. Costco Australia’s contact page corroborates the Lidcombe street address.

Costco US regional offices

For food and sundry vendor inquiries, Costco directs prospective suppliers to the appropriate division office. These eight entries come from its official vendor directory.

Download: Costco headquarters and global offices spreadsheet (.xlsx)

The workbook contains 22 records: the headquarters, a corporate mailing address, the separate vendor corporate listing, eight US regions, and eleven international entries. It includes address types, full source URLs, a review date, and notes on conflicting source details. It is an editorially checked snapshot, not a directory of every Costco building or warehouse.

Use BrowserAct for the next company-location dataset

Agent Built, templates, and your own Agent

A custom BrowserAct Agent Built task is a useful starting point when you have official URLs and need addresses in a consistent table. Define the office label, address, source URL, and rules for conflicting or missing values before collection begins.

A reusable template is useful when its source and fields match the task. For example, the Google Maps Business Listings Scraper collects public business-listing cards; its documented workflow does not open individual business detail pages. Use it for separate warehouse or local-business research, then check any headquarters claim against Costco’s own sources.

If you work inside a coding Agent, BrowserAct’s AI Agents CLI provides another route to browser access. That setup is separate from running a Bot in BrowserAct Cloud.

1. 1Open BrowserAct and choose Build with Agent

   Use the left-side + or the Build with Agent option. You can also enter a requirement in the central prompt box.

2. 2Copy the complete prompt

   Copy this prompt, then let the Agent build and test the extraction. It defines the source pages, office-list boundary, and conflict rules.

Use these public sources only:
https://investor.costco.com/resources/investor-contacts/default.aspx
https://www.costco.com/f/-/vendor-inquiries
 
Extract the corporate office from the investor page as one row.
Extract every US regional and International division office from the vendor page.
Return one row per published office entry, up to 25 rows.
Fields: company, office_label, address_as_published, source_url, verification_status.
Preserve source wording, country/region labels, and postcode differences.
Do not merge 999 Lake Drive with the vendor introduction’s 730 Lake Drive.
Exclude the vendor introduction’s corporate address and mailing PO box
from the division rows. Do not silently correct a postcode.
If a page is inaccessible, report the missing source; do not invent records.
Read public pages only. Do not submit forms or contact anyone.
If login, CAPTCHA, 2FA, or restricted access prevents collection,
stop and request human assistance.

3. 3Handle access requests when needed

   The task is limited to public pages. If access requires login, CAPTCHA, 2FA, or another restricted step, have the Bot stop and ask for human assistance.

4. 4Review the rows and export

   Check the corporate record and all published division entries. Keep source differences visible and review the structured output before using the available export options; convert CSV to XLSX in Excel if needed.

The Costco Bot result

The screenshot shows the actual Costco Bot test: 20 rows comprising one corporate office, eight US regions, and eleven international entries. The Bot retained the vendor page’s UK postcode as published. The 22-row workbook above was separately formatted and checked: it adds the mailing and vendor corporate listings, and documents the UK postcode correction with additional sources.

FAQ

Where is Costco Wholesale Corporation headquartered?

Costco’s investor and customer-service pages list 999 Lake Drive, Issaquah, WA 98027, United States, as its corporate office.

Is Costco headquartered in Seattle or Issaquah?

The corporate street address is in Issaquah, Washington. Seattle appears in the corporate mailing address: P.O. Box 34331, Seattle, WA 98124.

Where is Costco’s Canadian headquarters?

Costco’s Canadian customer-service page identifies 415 West Hunt Club Road, Ottawa, Ontario K2E 1C5, as its Canadian headquarters. The US vendor directory also lists this address for the Eastern Canada Region.

Does this list include every Costco warehouse?

No. It covers corporate and regional contact addresses. Use Costco’s warehouse locator for retail locations and their local details.

Can I visit headquarters for help with an order or membership?

A published office address does not establish walk-in customer support. Use Costco Customer Service for account, order, or membership assistance. Confirm an appointment with your contact before visiting an office.

Is the downloadable spreadsheet updated automatically?

No. It is a snapshot checked on September 10, 2026. Follow the linked official sources to recheck an address before mailing, visiting, or using it in a new dataset.