• Referendum sull'integrazione europea (36 P)

A

• Referendum in Andorra (3 P)
• Referendum in Armenia (1 P)
• Referendum in Austria (4 P)
• Referendum in Azerbaigian (6 P)

B

• Referendum in Belgio (2 P)
• Referendum in Bielorussia (2 P)
• Referendum in Bulgaria (6 P)

C

• Referendum a Cipro (2 P)
• Referendum in Croazia (3 P)

D

• Referendum in Danimarca (1 C, 6 P)

E

• Referendum in Estonia (2 P)

F

• Referendum in Finlandia (3 P)
• Referendum in Francia (18 P)

G

• Referendum in Germania (1 C, 4 P)
• Referendum in Grecia (10 P)
• Referendum in Groenlandia (2 P)

I

• Referendum in Irlanda (10 P)
• Referendum in Islanda (4 P)
• Referendum in Italia (4 C, 27 P)

L

• Referendum in Lettonia (13 P)
• Referendum in Lituania (4 P)
• Referendum in Lussemburgo (1 P)

M

• Referendum in Macedonia del Nord (1 P)
• Referendum a Malta (5 P)
• Referendum in Moldavia (1 P)
• Referendum in Montenegro (2 P)

N

• Referendum in Nagorno Karabakh (4 P)
• Referendum in Norvegia (3 P)

P

• Referendum in Polonia (7 P)

R

• Referendum nel Regno Unito (7 P)
• Referendum in Repubblica Ceca (1 P)
• Referendum in Romania (14 P)
• Referendum in Russia (2 P)

S

• Referendum a San Marino (15 P)
• Referendum in Slovacchia (2 P)
• Referendum in Slovenia (9 P)
• Referendum in Spagna (6 P)
• Referendum nei Paesi Bassi (1 P)
• Referendum in Svezia (4 P)
• Referendum in Svizzera (10 P)

T

• Referendum in Turchia (6 P)

U

• Referendum in Ucraina (8 P)
• Referendum in Ungheria (8 P)