This article deals with some place names in the form of pluralia tantum, mentioned in the Old Russian chronicles in the middle and the late periods of the history of the Russian language (the 14-17^th centuries), provides their etymological, nominational, word-formative and stratigraphical analysis. These toponyms are derived mostly from geographical terms, more rarely from hydronyms and names of man-made objects. The activity of this type was gradually growing from the 14^th century till the 16^th, but in the 17^th century it declined. The main area of the plural oikonyms is the land of Novgorod and Pskov.