Machine translation of the Portuguese Wikipedia article (November 2026 version).
Duque de Caxias is a Brazilian municipality in the state of Rio de Janeiro, in the Southeast Region of the country. It is located in the Baixada Fluminense, in the Metropolitan Region of Rio de Janeiro, 16 km from the state capital. According to the 2024 IBGE census, its population is 866,347 inhabitants, making it the most populous municipality in the Baixada Fluminense, the third most populous in the state and the 22nd most populous in the country.
It became a municipality in 1943, after separating from the city of Nova Iguaçu.
The name of the city honours the patron of the Brazilian Army, Luís Alves de Lima e Silva, the Duke of Caxias, also known as The Pacifier, who was born in the region in 1803.
Alongside Nova Iguaçu, Duque de Caxias is one of the regional centres of the Baixada Fluminense, retaining a large part of the workforce of the 13 municipalities of this sub-region of the Rio de Janeiro metropolis. The city has the largest GDP and the largest industrial park in the Baixada region, and is the second largest exporter in the state of Rio, behind only the capital.
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