2003 Estonian European Union membership referendum

2003 Estonian European Union membership referendum
Are you in favor of joining the European Union and adopting amendments to the Constitution of the Republic of Estonia?
Results
For 50%–60% 60%–70% 70%–80%	Against 50%–60% 60%–70% 70%–80%

A referendum took place on 14 September 2003 to decide whether Estonia should join the European Union (EU). Just over two-thirds of voters voted Yes and Estonia joined the EU on 1 May 2004.