Jerwen County (German: Kreis Jerwen or Kreis Weissenstein, Estonian: Järva kreis or Paide kreis, Russian: Вейсенштейнскій/Еервенскій уѣздъ, romanized: Veysenshteynskiy/Yervenskiy uyezd) was one of the four counties of the Russian Empire located in the Governorate of Estonia.

[1] It was situated in the central part of the governorate (in present-day northern Estonia).

[2] At the time of the Russian Empire Census of 1897, Jerwen County had a population of 52,673.

Of these, 96.7% spoke Estonian, 2.2% German, 0.8% Russian, 0.1% Yiddish and 0.1% Latvian as their native language.

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