Petrópolis, also known as The Imperial City, is a municipality in the Southeast Region of Brazil, located 68 kilometres (42 mi) northeast of Rio de Janeiro. According the 2010 National Brazilian Census, Petrópolis municipality had 305,917 inhabitants that year, up from 286,537 inhabitants at the last census. Besides being the largest and most populous city in the Fluminense Mountain Region, the city also has the largest GDP and HDI in the region. Petrópolis is considered the safest city in the state of Rio de Janeiro and the sixth safest city in Brazil, according to IPEA classification for medium and large cities.
The town's name ("city of Peter") honors Pedro II, the last Emperor of Brazil, who is entombed there at the Cathedral of Saint Peter of Alcantara. The city was the summer residence of the Brazilian Emperors and aristocrats in the 19th century, and was the official capital of the state of Rio de Janeiro during the First Brazilian Republic, between 1894 and 1902.
There are projects to annex Petropolis again to the Metropolitan Region of Rio de Janeiro, because it is linked to the capital by political and economic ties, and contain one of the state's largest HDIs.