China, Cuba, Laos, Vietnam and North Korea are self-declared communist states.
Russia
Marx was the father of communism, hence why it is called marxism or marx economy. Communism is the belief that everyone is equal within the country that practices this form of an economy. An example would be the USSR, which was a communist country leaded by Joseph Stalin.
Venezuela.
Cuba was the first Caribbean country to move to communism.
What? Communism has never been developed in a country before
The US
china
It is a capitalist country.
China or Cuba
Cuba
Communism is not a form of government; it's an economic form. Additionally, pure communism is highly Utopian and extremely impractical in real life. As such, I am not aware of any country actually using the Marxist/Leninist model of Communism as an economic model nowadays.
North KoreaPoland