{{flag|San Marino|1862}} – Most Serene Republic of San Marino
{{flagcountry|Kingdom of Sarawak|1848}} – Kingdom of Sarawak
{{Flagicon image|Flagge_Herzogtum_Sachsen-Coburg-Gotha_(1826-1911).svg}} Saxe-Altenburg – Duchy of Saxe-Altenburg {{small|(to July 1)}}
{{Flagicon image|Flagge_Herzogtum_Sachsen-Coburg-Gotha_%281911-1920%29.svg}} Saxe-Coburg and Gotha – Duchy of Saxe-Coburg and Gotha {{small|(to July 1)}}
{{Flagicon image|Flagge_Herzogtum_Sachsen-Meiningen.svg}} Saxe-Meiningen – Duchy of Saxe-Meiningen {{small|(to July 1)}}
{{Flagicon image|Flagge_Gro%C3%9Fherzogtum_Sachsen-Weimar-Eisenach_%281813-1897%29.svg}} Saxe-Weimar-Eisenach – Grand Duchy of Saxe-Weimar-Eisenach {{small|(to July 1)}}
{{flagcountry|Kingdom of Saxony}} – Kingdom of Saxony {{small|(to July 1)}}
{{Flagicon image|Flagge_F%C3%BCrstentum_Lippe.svg}} Schaumburg-Lippe – Principality of Schaumburg-Lippe {{small|(to July 1)}}
{{Flagicon image|Flagge_F%C3%BCrstent%C3%BCmer_Schwarzburg.svg}} Schwarzburg-Rudolstadt – Principality of Schwarzburg-Rudolstadt {{small|(to July 1)}}
{{Flagicon image|Flagge_F%C3%BCrstent%C3%BCmer_Schwarzburg.svg}} Schwarzburg-Sondershausen – Principality of Schwarzburg-Sondershausen {{small|(to July 1)}}
{{Flagicon image|Flag_of_Selangor.svg}} Selangor – Sultanate of Selangor
{{Flagicon image|Civil Flag of Serbia.svg}} Serbia – Principality of Serbia
{{Flag|Thailand|1855|name=Siam}} – Kingdom of Siam
{{noflag}}Sikkim – Chogyalate of Sikkim
{{Flagicon image|Flag of the Sokoto Caliphate.svg}} Sokoto – Sokoto Caliphate
{{flagcountry|South African Republic}} – South African Republic
{{Flag|Spain|1785}} – Kingdom of Spain
{{Flagicon image|18th Century Flag of Sulu.svg}} Sulu – Sultanate of Sulu
{{Flag|Sweden|1844}} – Kingdom of Sweden (in personal union with Norway)
{{Flag|Switzerland}} – Swiss Confederation
T
{{Flagicon image|Flag_of_the_Tahiti_Protectorate_1843-1880.svg}} Tahiti – Kingdom of Tahiti
{{noflag}}Tonga – Kingdom of Tonga
{{Flagicon image|Flag of Toro, Uganda.svg}} Toro – Toro Kingdom
{{noflag}}Toucouleur – Toucouleur Empire
U
{{Flagcountry|United Kingdom of Great Britain and Ireland|1801}} – United Kingdom of Great Britain and Ireland
{{Flagdeco|United States|1865}} → {{Flag|United States|1867}} – United States of America
{{Flag|Uruguay}} – Eastern Republic of Uruguay
V
{{Flag|Venezuela|1863}} – United States of Venezuela
W
{{Flagicon image|Flag of Germany (3-2 aspect ratio).svg}} Waldeck-Pyrmont – Principality of Waldeck and Pyrmont {{small|(to July 1)}}
{{noflag}}Welayta – Kingdom of Welayta
{{flag|Württemberg}} – Kingdom of Württemberg
Y
{{noflag}}Yeke – Yeke Kingdom
Z
{{Flag|Zanzibar|Sultanate}} – Sultanate of Zanzibar
{{noflag}}Zululand – Kingdom of the Zulus
States claiming sovereignty
{{Flagicon image|Sultanate of Aceh Flag.png}} Aceh – Sultanate of Aceh
{{noflag}}Goust – Republic of Goust
{{Flagicon image|Flag of Maguindanao.svg}} Mindanao – Sultanate of Maguindanao
{{Flagicon image|Flag_of_Tavolara.gif}} Tavolara – Kingdom of Tavolara
{{Lists of sovereign states by year |expanded=CE}}