This dissertation approach is concerned to cities digital representation. It is the result of a research that was motivated by the following problem: how have the Brazilian cities been officially represented in the digital world? We admit, as a premise, that cities official sites are more a representational form of cities and, thus, they must be understood as signs and as objects of Design. Our general goal was investigate the semiosis of design in Brazilian digital cities in order to build up some reflections which might be able to assist designers in the task of representing the cities officially in the digital world. The empirical object of this inquiry was constituted by the official sites of Brazilian Southeastern capital cities. The undertaken readings and analyzes have had as theoretical referential, mainly, Charles Sanders Peirce`s lessons about Semiotics and the Matrices of language and thought proposed by Lucia Santaella. At the end of the research, we have noticed that Peirce`s Semiotics is full of tools that can assist designers in the construction and in the analysis of digital cities. Moreover, from the analyzes of the official sites of Brazilian Southeastern capitals, we have developed some considerations related to some dimensions of those sites, namely Syntactic, Pragmatic and Semantics ones, which are extensible to other Governmental Brazilian digital cities.