As of 2020-08-17, the following countries are considered part of the European Economic Area (EEA) and in scope of Strong Customer Authentication (SCA) regulation:
Austria = AT
Belgium = BE
Bulgaria = BG
Croatia = HR
Cyprus = CY
Czech Republic = CZ
Denmark = DK
Estonia = EE
Finland = FI
France = FR
Germany = DE
Gibraltar = GI
Greece = GR
Hungary = HU
Iceland = IS
Ireland = IE
Italy = IT
Latvia = LV
Liechtenstein = LI
Lithuania = LT
Luxembourg = LU
Malta = MT
Netherlands = NL
Norway = NO
Poland = PL
Portugal = PT
Romania = RO
Slovakia = SK
Slovenia = SI
Spain = ES
Sweden = SE
Switzerland = CH*
United Kingdom = GB*
*see Additional Information below
Though the UK may not be a part of the EEA in the future, they intend to implement or follow SCA regulation.
Although Switzerland is outside of the European Economic Area (EEA), Swiss merchants will need to meet SCA requirements because Stripe’s acquiring bank for Swiss merchants is located in the UK.