This article is part of a broader research that focuses on the literary representation of popular neighborhoods, slums, and tenements in the major Latin American cities at the end of the 19th and beginning of the 20th centuries. The section presented below corresponds to the Mexican realist writer Ángel de Campo y Valle, who, during the same period as the modernist chronicles of Gutiérrez Nájera and Amado Nervo, which exalt technical and urban advances from an aesthetic and cosmopolitan standpoint, dedicates himself, in contrast, to portraying the less favored social sectors of Mexico City in a literary manner, their system of values, and their local color. The methodology I employ is the comparative study of different literary (stories, journalistic chronicles, and novels) whose thematic and articulating axis is the profiling of the new urban poor.