China, North Korea, and Cuba.
In addition, Vietnam and Laos are Communist countries.
Most political scientist classify North Korea as "Communist-in-name-only"; functionally, they are a hereditary Dictatorship run by a small oligarchy.
China (mainland, aka People's Republic of China) is also not what is typically thought of as a Communist government. While they have many broad characteristics of (and originated as) a traditional Communist government, they are also a unique fusion with pure representative republic and traditional Chinese imperial government forms. So, while at first glance they are Communist, a closer look reveals a very unique (and very complex) form of government.
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Communist State is used by four countries. Here is the list: People's Republic of China, Republic of Cuba, Lao People's Democratic Republic, and Socialist Republic of Vietnam.
China, North Korea, and Cuba. (There were many more 20 years ago, including the Soviet Union, and its satellite Eastern European countries.)