Some Remarks On the Development of Russian Prostorečie The paper provides a brief outline of Russian prostorečie (urban popular language), which is the supraregional language variety spoken by uneducated or half educated urban population, that doesn’t know the norms of standard language. Phonetic, morphosyntactic and lexical peculiarities of this language variety are illustrated by means of a real sample of Russian prostorečie: a letter written by an 80-year-old woman. The article also focuses attention on the development of a new prostorečie, which, with respect to old prostorečie, is characterized exclusively on lexical plane, and is the source by which slang and professional elements penetrate into the standard language.