After learning that there were a couple new stations not on this map, I reached out to Costco - KirklandSignatureFuel@costco.com and received an awesome reply! Here's what they said:
Hello!
Thank you for your email. I like the map. 
We have a total of 78 U.S. Costco locations that offer diesel. Bismarck, Idaho Falls and our Commerce, CA Business Center have been added since 2019. It looks like the map has 77 locations and is missing Commerce Business Center located at: 6333 Telegraph Road, Commerce, CA 90040 - they are closed on Sundays.
However, we have removed diesel from two locations since 2019, so the following should be removed from the map:
- Norwalk located at: 12324 Hoxie Ave, Norwalk, CA 90650
- San Jose (Great Oaks) located at: 6898 Raleigh Road, San Jose, CA 95119
So, with the above addition, this puts the map at a count of 78 - 2 = 76. We removed diesel from 2 Georgia locations in 2019, but they aren't listed on the map. So, I've attached a current list of our diesel locations, sorted by state, as I'm not sure how to best determine what two sites aren't showing up. I hope this helps?
Also, please note that the Costco mobile app can be used to filter by diesel and pull locations up on a map, see their hours of operation and the price of gas or diesel. The filter option can be found either through the warehouse locator or the gas prices option (select filter, then select diesel).
Best wishes for adventurous travels.
Sincerely,
Mandi Jackson
