Petrópolis is a city of the estado (state) of central Rio de Janeiro, in southeastern Brazil, in a valley of the Órgãos Mountains, 40 kilometres (25 mi) north of Rio de Janeiro city. According to the 2022 Brazilian census, Petrópolis municipality had a population of 278,881 inhabitants. Besides being the largest and most populous city in the Fluminense Mountain Region, the city also has the largest Gross Domestic Product and Human Development Index in the region.