The uezd was eponymously named for its administrative center, Disna, which was belonged to present-day Dizsna in Belarus.

The territory of Disna uezd corresponds to a part of the present-day Miory, Hlybokaye, Sharkawshchyna, and Pastavy districts of Vitebsk Region.

At the time of the Russian Empire Census of 1897, Disnensky Uyezd had a population of 204,923.

Of these, 81.1% spoke Belarusian, 10.1% Yiddish, 5.9% Russian, 2.4% Polish, 0.3% Lithuanian, 0.1% German and 0.1% Latvian as their native language.

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