S&S Petroleum owns and operates 80 stores and is based in Mukilteo, Wash. It does business as an ampm franchisee, unbranded stores and is building its first store under the brand Royal Mart.

For benchmarking purposes, store counts are as of Jan. 1, 2022.

Headquarters:Mukilteo, Wash.
No. of Stores:80
Rank:82
Website:http://sspetro.com/