Present article is the fragment of the study, dedicated to the analysis of the unofficial names urban realias of Yekaterinburg, which compose the special nominal layer of the conversational sub-standard vocabulary, created by townspeople out of the official urban onomastics. The data about the quantitative composition of urban realias of Yekaterinburg are cited, quantity of unofficial urbanonimes, their naming is revealed, the reasons for the appearance of unofficial onomastics in the speech of townspeople are determined.