In addition to being one of the biggest Credit Card issuers in the world, Citibank is one of the largest Private Label Credit Card (PLCC) in the United States.  It has partnered with many major retailers offering store credit cards and store co-branded credit cards.  Below is the complete listing of Citibank Private Label Credit Cards as of June 2016.

AT&T Universal Card
Brandsource
Best Buy
Big O Tires
Children Place
Exxon
Goodyear
Home Depot
Littman Jewelers
Macys
Merchants Tire
NTB Tire
Office Depot
Ross-Simons
Sears
Shell
Sidney Thomas
Staples
Tire Kingdom
Zales

The other big Private Label Credit Card (PLCC) companies include Synchrony, Comenity Bank and Capital One.