Name
Romania
Bulgaria
Greece
Serbia
Official name
Romania (România )
Republic of Bulgaria (Република България / Republika Bŭlgariya )
Hellenic Republic (Ελληνική Δημοκρατία )
Republic of Serbia (Република Србија / Republika Srbija )
Coat of Arms
Flag
Population
19,051,562 (2023)[ 15]
6,447,710 (2022)[ 15]
10,482,487 (2022)[ 15]
6,664,449 (2023)[ 16]
Area
238,397 km2 (92,046 sq mi)
110,993.6 km2 (42,854.9 sq mi)
131,957 km2 (50,949 sq mi)
77,747 km2 (29,913 sq mi)(excluding Kosovo)
Population Density
84.4/km2 (218.6/sq mi)
58/km2 (165.8/sq mi)
79,4/km2 (212.4/sq mi)
86/km2 (230.5/sq mi)
Government
Unitary Semi-presidential constitutional republic
Unitary parliamentary constitutional republic
Unitary parliamentary constitutional republic
Unitary parliamentary constitutional republic
Capital
Bucharest – 1,716,961 (2,304,408
metro)
Sofia – 1,248,452 (1,667,314 metro)
Athens – 643,452 (3,638,281 metro)
Belgrade – 1,383,875 (1,681,405 metro)
Largest City
Official language
Romanian
Bulgarian
Greek
Serbian
First Leader
Alexandru Ioan Cuza , Domnitor of the United Principalities (first ruler of the modern unified state). Burebista , King of Dacia (first leader of the Romanian peoples).
Khan Asparuh of Bulgaria (founder of the First Bulgarian Empire )
Governor Ioannis Kapodistrias (first head of state of the modern independent state)
Prince Višeslav of Serbia (first ruler known by name)
Current Head of Government
Prime Minister Marcel Ciolacu (PSD )
Prime Minister Nikolay Denkov (PP-DB )
Prime Minister Kyriakos Mitsotakis (New Democracy )
Prime Minister Ana Brnabić (SNS )
Current Head of State
President Klaus Iohannis (Independent but affiliated with PNL)
President Rumen Radev (Independent)
President Katerina Sakellaropoulou (Independent)
President Aleksandar Vučić (SNS )
Main religions
81% Eastern Orthodox , 6.2% Protestant , 5.1% Latin and Greek Catholic , 0.2% irreligious , 1.5% Other religious
59.5% Eastern Orthodox , 9.3% irreligious , 7.9% Islam , 0.9% Protestant , 0.7% Roman Catholic
90% Eastern Orthodox , 3% Other Christians (excluding Catholic ), 4% irreligious , 2% Islam , 3% Other religious (including Eastern or Western Catholic )
81.1% Eastern Orthodox , 3.9% Roman Catholic , 3.1% Islam , 1.11% irreligious , 0.99% Protestant , 3.54% Other religious
Ethnic groups
88.9% Romanians , 6.1% Hungarians , 3.3% Roma , 0.2% Ukrainians , 0.2% Germans
84.8% Bulgarians , 8.8% Turks , 4.9% Roma , 0.7% others
Greek 91.6%, Albanian 4.4%, other 4% [ 17]
87.5% Serbs , 2.8% Hungarians , 2.1% Roma , 2.3% Bosniaks , 9% others
GDP (nominal)
GDP (PPP)
External debt
36.8 % of GDP
20.4 % of GDP
178.2 % of GDP
48.2 % of GDP
Currency
Leu (L) – RON
Lev (лв) – BGN
Euro (€) – EUR
Serbian dinar (din) – RSD
Human Development Index