Carmo is a municipality in the Brazilian state of Rio de Janeiro. Its nickname is the Cidade Bela. Carmo encompasses an area of about …Carmo is a municipality in the Brazilian state of Rio de Janeiro. Its nickname is the Cidade Bela. Carmo encompasses an area of about 320 square kilometres. Its current population is estimated to be more than 19,000 inhabitants, of which 72.3% live in the suburban area.