|This article does not cite any references or sources. (December 2009)|
|State of Guanabara|
|Capital and Largest City||Rio de Janeiro|
|• Governor||Antônio de Pádua Chagas Freitas (last governor, 1971–75)|
|• Total||1,356 km2 (524 sq mi)|
|• Estimate (1975)||4,858,000|
|Demonym||carioca or guanabarino(a)1|
|Time zone||BRT (UTC-3)|
|• Summer (DST)||BRST (UTC-2)|
|ISO 3166 code||BR-GB|
|^1 Only used in official documents|
The State of Guanabara (Portuguese: Estado da Guanabara, IPA: [ɡwanaˈbaɾa]) was a former Brazilian state that existed from 1960 to 1975. It comprised the city of Rio de Janeiro, after the national capital was moved to Brasília in 1960. It was named after Guanabara Bay, which bordered its Eastern coast.
In 1834, the city of Rio de Janeiro became a municipality and was elevated to Imperial capital, but it was not part of any of the provinces of Brazil, having special status as the so-called "Neutral municipality" (Portuguese: Município Neutro). When Brazil became a republic in 1889, the city of Rio de Janeiro remained the national capital and became the Federal District (Distrito Federal), while the surrounding Rio de Janeiro Province became the Rio de Janeiro State, with Niterói as the capital.
Throughout its 15-year existence, Guanabara State was a peculiar, even anomalous state in many ways. Comprising only one city (albeit a large one), Guanabara was the smallest Brazilian state. It also had the peculiarity of being the only state that had no municipalities. Although for some practical purposes it was sometimes counted as having one single municipality, and Rio de Janeiro was officially named its capital, there was no mayor, municipal legislature or any other municipal government institutions there: the city of Rio de Janeiro was directly administered by the state government. On the other hand, this also meant that the Guanabara State government had some functions that were normally assigned to municipalities elsewhere, such as regulating urban zoning, inspecting the safety of buildings or issuing licenses for commercial venues, for example.
All these anomalies disappeared in 1975, when Guanabara State and Rio de Janeiro State merged, forming a new Rio de Janeiro State. The city of Rio de Janeiro became a new municipality and the capital of that state.