Population: 6.878 million (2021)
Language: Bulgarian
Dialing code: +359
President: Rumen Radev
Currency: Bulgarian Lev
GDP: 84.06 billion USD (2021)

Population: 6.834 million (2021)
Language: Serbian
Dialing code: +381
President: Aleksandar Vučić
Currency: Serbian Dinar
GDP: 63.08 billion USD (2021)

Population: 3.899 million (2021)
Language: Croatian
Dialing code: +385
President: Zoran Milanović
Currency: Euro (€) (EUR)
GDP: 68.96 billion USD (2021)

Population: 3.271 million (2021)
Language: Bosnian, Serbian, Croatian
Dialing code: +387
President: Željko Komšić
Currency: Bosnia-Herzegovina Convertible Marka
GDP: 23.37 billion USD (2021)

Population: 2.812 million (2021)
Language: Albanian
Dialing code: +359
President: Bajram Begaj
Currency: Albanian Lek
GDP: 18.26 billion USD (2021)

Population: 2.065 million (2021)
Language: Macedonian
Dialing code: +389
President: Gordana Siljanovska-Davkova
Currency: Macedonian Dinar
GDP: 13.83 billion USD (2021)

Population: 1.873 million (2020)
Language: Albanian, Serbian
Dialing code: +383
President: Vjosa Osmani
Currency: Euro (€) (EUR)
GDP: 9.41 billion USD (2022)

Population: 619.211 (2021)
Language: Montenegrin
Dialing code: +382
President: Jakov Milatović
Currency: Euro (€) (EUR)
GDP: 5.861 billion USD (2021) 

Population: 518.536 (2021)
Language: Maltese, English
Dialing code: +356
President: George Vella
Currency: Euro (€) (EUR)
GDP: 17.36 billion USD (2021)