The Sopron area plebiscite took place on 14–16 December 1921. In the plebiscite, the residents of an area of 257 km², comprising Sopron and eight surrounding settlements, voted on whether to remain in Hungary or to join Austria. After World War I, that was the only plebiscite concerning disputed borders on territory of the former Kingdom of Hungary that was permitted by the Entente.^[1][2]

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1921 Sopron plebiscite

14–16 December 1921 (1921-12-14 – 1921-12-16)
Ballot paper with the seal of the Entente commission
Results
Choice Votes  % Austria 8,227 34.92% Hungary 15,334 65.08% Valid votes 23,561 97.87% Invalid or blank votes 512 2.13% Total votes 24,073 100.00% Registered voters/turnout 26,879 89.56%

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The following settlements participated in the plebiscite. The Hungarian names are given, with their German counterparts in brackets:

• Ágfalva (Agendorf)
• Balf (Wolfs)
• Fertőboz (Holling)
• Fertőrákos (Kroisbach)
• Harka (Harkau)
• Kópháza (Kohlnhof)
• Nagycenk (Zinkendorf)
• Sopron (Ödenburg)
• Sopronbánfalva (Wandorf)

26,879 people were eligible to vote in the plebiscite. 24,063 of them voted. 15,534 voted for Hungary, while 8,227 voted for Austria. 502 ballots were invalid.

18,904 residents of Sopron had the right to vote in the plebiscite. (At the time of the plebiscite Sopron had 37,509 residents.) Here, with a turnout of 89.2%, a large majority (72.7%) voted for Hungary. However, in the 8 villages, the support for Austria was greater, with 5 villages voting for Austria. Only Nagycenk, Fertőboz and Kópháza voted for Hungary.