List of sovereign states in the 1820s

A

 * 🇦🇩 Andorra – Principality of Andorra
 * Anhalt-Bernburg – Duchy of Anhalt-Bernburg
 * Anhalt-Dessau – Duchy of Anhalt-Dessau
 * Anhalt-Köthen – Duchy of Anhalt-Köthen
 * Ankole – Kingdom of Ankole
 * Annam – Empire of Annam
 * Anziku – Anziku Kingdom
 * Argentina - United Provinces of the River Plate
 * Aro – Aro Confederacy
 * undefined – Asante Union
 * undefined – Austrian Empire

B

 * Baden – Grand Duchy of Baden
 * Baguirmi – Kingdom of Baguirmi
 * Bambara – Bambara Empire
 * Baol – Kingdom of Baol
 * Basutoland – Kingdom of Basutoland
 * undefined – Kingdom of Bavaria
 * undefined – Benin Empire
 * 🇧🇹 bhutan – Kingdom of Bhutan
 * → Bolivia – Bolivian Republic (from August 6, 1825)
 * Bornu – Bornu Empire
 * undefined – Empire of Brazil (from September 7, 1822)
 * undefined – Free City of Bremen
 * Brunei – Sultanate of Brunei
 * Brunswick – Duchy of Brunswick
 * Buganda – Kingdom of Buganda
 * Bukhara – Emirate of Bukhara
 * Bunyoro – Kingdom of Bunyoro-Kitara
 * Burma – Kingdom of Burma
 * Burundi – Kingdom of Burundi

C

 * Cambodia – Kingdom of Cambodia
 * Cayor – Kingdom of Cayor
 * → Central America
 * United Provinces of Central America (from July 1, 1823 to 1824)
 * Federal Republic of Central America (from 1824)
 * State of Chile (to July 14, 1826)
 * Republic of Chile (from July 14, 1826)
 * China – Great Qing Empire
 * → →  Colombia – Republic of Colombia
 * Cospaia – Republic of Cospaia
 * Cospaia – Republic of Cospaia

D

 * Dahomey – Kingdom of Dahomey
 * 🇩🇰 Denmark – Kingdom of Denmark
 * Durrani – Durrani Empire (to 1823)

E

 * undefined – Ethiopian Empire

F

 * Fiji – Tui Viti
 * → 🇫🇷 France – Kingdom of France
 * Frankfurt – Free City of Frankfurt
 * Futa Jallon – Imamate of Futa Jallon
 * Futa Toro – Imamate of Futa Toro

G

 * Garo – Kingdom of Garo
 * Gomma – Kingdom of Gomma
 * Gumma – Kingdom of Gumma

H

 * Kingdom of Haiti (to October 8, 1820)
 * Republic of Haiti (from October 8, 1820)
 * Hamburg – Free City of Hamburg
 * undefined – Kingdom of Hanover
 * Hawaii – Kingdom of Hawaii
 * Hesse-Darmstadt – Grand Duchy of Hesse and by Rhine
 * Hesse-Homburg – Landgraviate of Hesse-Homburg
 * Hesse-Kassel (or Hesse-Cassel) – Electorate of Hesse
 * Hohenzollern-Hechingen – Principality of Hohenzollern-Hechingen
 * Hohenzollern-Sigmaringen – Principality of Hohenzollern-Sigmaringen
 * Holstein – Duchy of Holstein
 * Holstein – Duchy of Holstein

I

 * Ionian Islands – United States of the Ionian Islands

J

 * Janjero – Kingdom of Janjero
 * Japan – Tokugawa shogunate
 * Jimma – Kingdom of Jimma
 * Johor – Johor Sultanate
 * – Jolof Kingdom

K

 * Kaabu – Kingdom of Kaabu
 * Kabul – Emirate of Kabul (from 1823)
 * Kaffa – Kingdom of Kaffa
 * Kénédougou – Kénédougou Kingdom
 * Khasso – Kingdom of Khasso
 * Khiva – Khanate of Khiva
 * Kokand – Khanate of Kokand
 * Kong – Kong Empire
 * Kongo – Kingdom of Kongo
 * Korea – Kingdom of Great Joseon
 * Koya Temne – Kingdom of Koya

L

 * 🇱🇮 Liechtenstein – Principality of Liechtenstein
 * Limmu-Ennarea – Kingdom of Limmu-Ennarea
 * Lippe – Principality of Lippe-Detmoldt
 * Loango – Kingdom of Loango
 * Luba – Luba Empire
 * Lubeck – Free City of Lubeck
 * Lunda – Lunda Empire
 * 🇱🇺 Luxembourg – Grand Duchy of Luxembourg

M

 * Madawaska – Republic of Madawaska (July 4 1827- September 25 1827)
 * Maldives – Sultanate of Maldives
 * Manipur – Kingdom of Manipur
 * Massina – Massina Empire
 * Mecklenburg-Schwerin – Grand Duchy of Mecklenburg-Schwerin
 * Mecklenburg-Strelitz – Grand Duchy of Mecklenburg-Strelitz
 * Mexico (from July 21, 1821)
 * Mexican Empire (from July 21, 1821 to March 19, 1823)
 * Mexican Republic (from November 1, 1823)
 * Mindanao – Sultanate of Maguindanao
 * Modena – Duchies of Modena and Reggio
 * Moldavia – Principality of Moldavia
 * 🇲🇨 Monaco – Principality of Monaco
 * Montenegro – Prince-Bishopric of Montenegro
 * 🇲🇦 Morocco – Sultanate of Morocco

N

 * Nassau – Duchy of Nassau
 * Nepal – Kingdom of Nepal
 * undefined – United Kingdom of the Netherlands
 * Norway – Kingdom of Norway (in a personal union with Sweden)

O

 * Oldenburg – Grand Duchy of Oldenburg
 * Ottoman Empire – Sublime Ottoman State
 * Ouaddai – Ouaddai Empire
 * Oyo – Oyo Empire

P

 * Pahang – Sultanate of Pahang
 * Papal States – States of the Church
 * 🇵🇾 → 🇵🇾 Paraguay – Republic of Paraguay
 * undefined – Duchy of Parma, Piacenza and Guastalla
 * Perak – Sultanate of Perak
 * Persia – Persian Empire
 * → →  Peru (from July 28, 1821)
 * Supreme Governing Junta (from July 20, 1822 to February 1823)
 * Peruvian Republic (from February 27, 1823)
 * Portugal – Kingdom of Portugal (from 1822)
 * Portugal, Brazil and the Algarves – United Kingdom of Portugal, Brazil and the Algarves (to 1822)
 * Prussia – Kingdom of Prussia
 * Sikh Empire Flag.png Punjab – Sikh Empire

R

 * Rapa Nui – Kingdom of Rapa Nui
 * Reuss-Ebersdorf – Principality of Reuss-Ebersdorf (to 1824)
 * Reuss Elder Line – Principality of Reuss Elder Line
 * Reuss-Lobenstein – Principality of Reuss-Lobenstein (to 1824)
 * Reuss-Lobenstein-Ebersdorf – Principality of Reuss-Lobenstein-Ebersdorf (from 1824)
 * Reuss Junior Line – Principality of Reuss Junior Line
 * Russia – Russian Empire
 * Rwanda – Kingdom of Rwanda
 * Ryūkyū Kingdom – Kingdom of Ryūkyū

S

 * Samoa – Kingdom of Samoa
 * 🇸🇲 San Marino – Most Serene Republic of San Marino
 * undefined – Kingdom of Sardinia
 * Saxe-Altenburg – Duchy of Saxe-Altenburg (from 1826)
 * Saxe-Coburg-Saalfeld – Duchy of Saxe-Coburg-Saalfeld (to 1826)
 * Saxe-Coburg-Gotha – Duchy of Saxe-Coburg and Gotha (from 1826)
 * Saxe-Gotha-Altenburg – Duchy of Saxe-Gotha-Altenburg (to 1826)
 * Saxe-Hildburghausen – Duchy of Saxe-Hildburghausen (to 1826)
 * Saxe-Meiningen – Duchy of Saxe-Meiningen
 * Saxe-Weimar-Eisenach – Grand Duchy of Saxe-Weimar-Eisenach
 * undefined – Kingdom of Saxony
 * Schaumburg-Lippe – Principality of Schaumburg-Lippe
 * Schleswig – Duchy of Schleswig
 * Schwarzburg-Rudolstadt – Principality of Schwarzburg-Rudolstadt
 * Schwarzburg-Sondershausen – Principality of Schwarzburg-Sondershausen
 * Selangor – Sultanate of Selangor
 * 🇹🇭 Siam – Kingdom of Siam
 * Sikkim – Chogyalate of Sikkim
 * Sokoto – Sokoto Caliphate
 * 🇪🇸 Spain – Kingdom of Spain
 * Sulu – Sultanate of Sulu
 * 🇸🇪 Sweden – Kingdom of Sweden (in personal union with Norway)
 * 🇨🇭 Switzerland – Swiss Confederation

T

 * Tahiti – Kingdom of Tahiti
 * Tonga – Tu'i Tonga
 * Toro – Toro Kingdom (from 1822)
 * Tuscany – Grand Duchy of Tuscany
 * Two Sicilies – Kingdom of the Two Sicilies

U

 * undefined – United Kingdom of Great Britain and Ireland
 * 🇺🇸 → 🇺🇸 United States – United States of America

W

 * Waldeck-Pyrmont – Principality of Waldeck and Pyrmont
 * Welayta – Kingdom of Welayta
 * Württemberg – Kingdom of Württemberg

Z

 * Zululand – Kingdom of the Zulus

States claiming sovereignty

 * Equator – Confederation of the Equator (from 2 July 1823 to September or October 1823)
 * Goust – Republic of Goust
 * Greece – Hellenic Republic (from January 1, 1822)
 * Muskogee – State of Muskogee
 * Soran – Soran Emirate