Nearly two dozen young migrants were taken to Switzerland from overcrowded camps in Greece on Saturday, according to the Greek Migration Ministry.
The 18 boys and five girls, between ages 10 and 17, came from Afghanistan and Congo-Brazzaville, and had relatives in Switzerland, the ministry added.
Germany took in 47 and Luxembourg 12 unaccompanied minors in mid-April.
Last Saturday, Britain became the first non-EU country to take in 16 underage migrants.
The European Union plans to shelter around 1,600 unaccompanied minors from the overcrowded camps in member states.
There are tens of thousands of people in five major camps for asylum seekers and migrants on the eastern Aegean islands, several times their projected capacity.