Juiz de Fora, also known as J.F., is a city in the southeastern Brazilian state of Minas Gerais, approximately 40 kilometres from the state bor…Juiz de Fora, also known as J.F., is a city in the southeastern Brazilian state of Minas Gerais, approximately 40 kilometres from the state border with Rio de Janeiro. According to the 2022 census the current population is 540,756 inhabitants. The geographical area of the municipality is 1,437 km².