I'm sorry if I don't have the version of their names that you like.
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Northern Italy (Italy Veneziano)
Official name: Repubblica Italiana (Italian Republic)
Name: Feliciano Vargas
Age: 20
Height: 172 cm (5'7.7")
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Germany
Official name: Bundesrepublik Deutschland (Federal Republic of Germany)
Name: Ludwig
Age: 20
Height: 180 cm (5'11")
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Japan
Official name: Nihon-koku (State of Japan)
Name: Honda Kiku
Age: Secret
Height: 165 cm (5'5")
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America
Official name: United State of America
Name: Alfred F. Jones
Age: 19
Height: 177 cm (5'9.6")
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England
Official name: The United Kingdom of Great Britain and Northern Ireland
Name: Arthur Kirkland
Age: 23
Height: 175 cm (5'9")
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France
Official name: République française (French Republic)
Name: Francis Bonnefoy
Age: 26
Height: 175 cm (5'9")
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China
Official name: People's Republic of China
Name: Wang Yao
Age: 4000
Height: Unknown (Thought to be 169 cm [5'6.5"])
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Russia
Official name: Rossiyskaya Federatsiya (Russian Federation)
Name: Ivan Braginski
Age: Unknown
Height: 182 cm (5'11.6") [Tallest Hetalia character]
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Spain
Official name: España (Spain or the Kingdom of Spain)
Name: Antonio Fernández Carriedo
Age: 25
Height: Unknown
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Southern Italy (Italy Romano)
Official name: Repubblica Italiana (Italian Republic)
Name: Lovino Vargas
Age: 22-23
Height: Unknown
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Hungary
Official name: Magyar Köztársaság (Republic of Hungary)
Name: Elizaveta Héderváry
Age: Unknown
Height: Unknown
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Austria
Official name: Republik Osterreich (Republic of Austria)
Name: Roderich Edelstein
Age: Unknown
Height: Unknown
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Prussia
Official name: None. (But you could use Prūsawhich is Prussia in Old Prussian or Preußen which is Prussia in German.)
Name: Gilbert Beilschmidt (Weillschmidt is not a last name. It is made up.)
Age: 20+
Height: Unknown
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Lithuania
Official name: Lietuvos Respublika (Republic of Lithuania)
Name: Toris Lorinaitis
Age: 19
Height: Unknown
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Poland
Official name: Rzeczpospolita Polska (Republic of Poland)
Name: Feliks Łukasiewicz
Age: 19
Height: Unknown
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Latvia
Official name: Latvijas Respublika (Republic of Latvia)
Name: Raivis Galante
Age: 15
Height: Unknown
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Estonia
Official name: Eesti Vabariik (Republic of Estonia)
Name: Eduard Von Bock
Age: 17
Height: Unknown
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Belarus
Official name: Republic of Belarus
Name: Natalia "Natasha" Arlovskaya
Age: 19
Height: Unknown (Said to be 160 cm [5'3"])
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Ukraine
Official name: Ukraine
Name: None. (Her fandom name is Yekaterina "Katyusha" Braginskaya and a popular name for her in Russia is Olga)
Age: Unknown
Height: Unknown
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Switzerland
Official name: Schweizerische Eidgenossenschaft (Swiss Confederation)
Name: Vash Zwingli
Aged: 18
Height: Unknown
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Liechtenstein
Official name: Principality of Liechtenstein
Name: None. (Her fandom name is Lili or Lily. Lili is shortened from Liechtenstein while Lily is her national flower)
Age: Unknown. (Thought to be 15)
Height: Unknown.
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Finland
Official name: Republic of Finland
Name: Tino Väinämöinen
Age: 20
Height: Unknown (Said to be 170 cm [5'7"])
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Sweden
Official name: Kingdom of Sweden
Name: Berwald Oxenstierna
Age: 21
Height: Unknown
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Iceland
Official name: Republic of Iceland
Name: None. (His fandom names are Aisu [Japanese word for ice], Ice [That's a tough one] Jökull [Icelandic word of glacier], and Erik [an unpopular fandom name])
Age: Unknown.
Height: Unknown.
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Turkey
Official name: Republic of Turkey
Name: Sadık Adnan
Age: Unknown.
Height: Unknown.
______________________
Greece
Official name: Hellenic Republic
Name: Heracles Karpusi
Age: 27
Height: Unknown
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Egypt
Official name: Arab Republic of Egypt
Name: Gupta Muhammad Hassan
Age: Unknown.
Height: Unknown.
______________________
Canada
Official name: Canada
Name: Matthew Williams
Age: Unknown. (Thought to be 19 like America)
Height: Unknown.
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Cuba
Official name: Republic of Cuba
Name: None.
Age: Unknown.
Height: Unknown.
______________________
Taiwan
Official name: Republic of China
Name: None.
Age: Unknown.
Height: Unknown.
______________________
South Korea
Official name: Republic of Korea
Name: Im Yong Soo
Age: 15-16
Height: Unknown.
______________________
Hong Kong
Official name: Hong Kong Special Administrative Region of the People's Republic of China
Name: None. (His fandom names are Kauro [Which is Japanese, not Chinese], Hong [The Hong in Hong Kong[, Kou, and Horace Wang/Wong [A popular Chinese fandom name])
Age: Unknown.
Height: Unknown.
______________________
Seychelles
Official name: Republic of Seychelles
Name: None.
Age: Unknown.
Height: Unknown.
______________________
Sealand
Official name: Principality of Sealand
Name: Peter Kirkland
Age: 12
Height: Unknown.
______________________
Grandpa Rome
Official name: Imperium Romanum
Name: None.
Age: Unknown.
Height: Unknown.
______________________
Holy Rome
Official name: Heiliges Roemisches Reich (Holy Roman Empire)
Name: None.
Age: Unknown.
Height: Unknown. (Approximately 91 cm ['3] as a child)
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Every bodies a Republic now a days! 20 republics (Including Hong Kong)! It's the new fashion among countries.