Estonia was independent in 1918, formed from Estland gubernia and northern Livonia gubernia of the Russian Empire, but was a republic of the USSR between 1940 and 1989. It regained independence in 1991.

Eesti Riiklik Ajaloo Keskarhiv (Estonian State Historical Archives)
J. Liivi 4; 202400 Tartu
Estonia
(Holds records before 1917)

Eesti Riigiarhiiv (Estonian State Archives)
Maneezhi 4; 15019 Tallinn
Estonia
(Holds records after 1917)

A. Beare, Jewish Ancestors? A Guide to Jewish Genealogy in Latvia and Estonia , London: Jewish Genealogical Society of Great Britain, 2001

'Judaica in the Historical Archives of Estonia', by Tatiana Shor, in Avotaynu IX:3 (Autumn 1993), pp. 15-16

All Jewish birth, marriage and death records in Estonia were microfilmed in 1993-94 and are available here in 1995. (Tartu 1897-1926, Tallin 1872-1940, Valga 1919-25, Voru 1883-1925). See Avotaynu XII:2 (Summer 1996), p. 43.