---
title: "What is the email format at Costco?"
description: "Costco uses the flast@costco.com email pattern on costco.com."
canonical: "https://derrick-app.com/company/costco/email-format"
category: "Company"
updated: "2026-10-13"
---

# What is the email format at Costco?

> Costco uses the `flast@costco.com` pattern on `costco.com`.

*Canonical: https://derrick-app.com/company/costco/email-format* · *Company*

---

A pattern is a convention, not a guarantee: it holds for most mailboxes and fails on
collisions and legacy accounts. Verify before sending.

*Get this data with Derrick → Email Finder: https://derrick-app.com/features/email-finder*

## About Costco

- **Name:** Costco
- **Website:** https://www.costco.com
- **Industry:** Membership warehouse clubs and retail
- **Founded:** 1983
- **Employees:** approximately 355,000
- **Headquarters:** 999 Lake Drive, Issaquah, Washington 98027, United States
- **Listed as:** COST (Nasdaq)
- **Specialties:** Membership warehouse clubs, Merchandising, Private label (Kirkland Signature), E-commerce, Gasoline, pharmacy and optical services, Business centers, Travel, Warehouse operations

*Get this data with Derrick → Enrich Companies: https://derrick-app.com/features/enrich-companies*

- [Full Costco profile](https://derrick-app.com/company/costco)

## About our data

Enriched by Derrick from public sources: the company website, filings, its LinkedIn page and the press. Individual emails and phone numbers are never published here.

- **Data as of:** 2026-10-13
- **Last verified:** 2026-10-13
- **Checks run:** Leadership, News, C-suite
- **Staff figures:** Estimated

## Enriching a list rather than one company

This page covers Costco alone. To do the same across a whole list of accounts -
firmographics, decision makers, verified emails and phone numbers - Derrick enriches it
in its web app (nothing to install), in Google Sheets, through an MCP server or a REST API.
Billed per verified match; the free plan includes 100 credits per month.

- Derrick web app: https://app.derrick-app.com
- Derrick: https://derrick-app.com