Joana,
Do you mean Macae Sports is from the State(!) Rio de Janeiro? Because according to Leandro's blog Unilever is the only Superliga-team from the City(!) Rio de Janeiro?
And to be honest, I thought only the inhabitants of the City are called Carioca's
Rio de Janeiro is a city and a state as well. Therefore both posts are correct. Unilever is the only team from the city Rio de Janeiro but not the only one from the state Rio de Janeiro.