Algeria Algeria 441 Carthaginian Empire Carthaginian Empire 217 Punic Iberia Punic Iberia 57 Oba Oba 1 Germany Germany 21.583 Ober Ost Ober Ost 3 Djibouti Djibouti 91 Djibouti Djibouti 84 Obock Territory (1862-1896) Obock Territory (1862-1896) 5 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Western Hispania Ulterior Western Hispania Ulterior 49 Turdetani people Turdetani people 39 Obulco Obulco 4 Greece Greece 7.093 Greece (ancient) Greece (ancient) 6.643 Thrace Thrace 402 Odessos Odessos 11 Italy Italy 37.242 Rome Rome 33.420 Roman provinces Roman provinces 1.269 Moesia Inferior Moesia Inferior 91 Odessos Odessos 6 Greece Greece 7.093 Greece (ancient) Greece (ancient) 6.643 Thrace Thrace 402 Odrysae Odrysae 1 Italy Italy 37.242 Rome Rome 33.420 Roman provinces Roman provinces 1.269 Africa Proconsularis Africa Proconsularis 24 Oea Oea 10 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Northern Iberia Northern Iberia 22 Berones people Berones people 12 Oilaunikos gens Oilaunikos gens 1 Greece Greece 7.093 Greece (ancient) Greece (ancient) 6.643 Akarnania Akarnania 88 Oiniadai Oiniadai 1 Ionia Ionia 436 Oinoe Oinoe 2 Macedon Macedon 559 Oisyme Oisyme 1 Thessaly Thessaly 533 Oitaioi Oitaioi 7 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Celtiberia Celtiberia 35 Pellendones people Pellendones people 6 Okalakom Okalakom 1 Greece Greece 7.093 Greece (ancient) Greece (ancient) 6.643 Skythia Skythia 44 Olbia Olbia 26 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Meseta Plateau Meseta Plateau 9 Olcades people Olcades people 3 City of Erkauika City of Erkauika 1 Ikalkusken Ikalkusken 2 Switzerland Switzerland 2.570 Swiss cantons Swiss cantons 2.293 Old Swiss Confederacy Old Swiss Confederacy 31 Monetary Union of Uri and Nidwalden Monetary Union of Uri and Nidwalden 12 Schwyz and Unterwalden Uri Schwyz and Unterwalden Uri 19 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Northern Iberia Northern Iberia 22 Berones people Berones people 12 Olkairun Olkairun 1 Algeria Algeria 441 Carthaginian Empire Carthaginian Empire 217 Punic Iberia Punic Iberia 57 Olontigi Olontigi 1 Greece Greece 7.093 Greece (ancient) Greece (ancient) 6.643 Macedon Macedon 559 Olophyxos Olophyxos 2 Thessaly Thessaly 533 Olosson Olosson 1 Crete (ancient) Crete (ancient) 100 Olous Olous 1 Elis Elis 121 Olympia Olympia 120 Lycia Lycia 49 Olympos Olympos 2 Macedon Macedon 559 Olynthos Olynthos 5 Oman Oman 244 Dhofar Governorate Dhofar Governorate 6 Muscat and Oman Muscat and Oman 49 Oman Oman 189 Mesopotamia Mesopotamia 12 Omani people Omani people 1 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Northern Iberia Northern Iberia 22 Vascones people Vascones people 10 Ontikes gens Ontikes gens 1 Greece Greece 7.093 Greece (ancient) Greece (ancient) 6.643 Troas Troas 158 Ophrynion Ophrynion 3 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Peninsular Northeast Peninsular Northeast 25 Sedetani people Sedetani people 12 Oppidum of Saltuie Oppidum of Saltuie 2 South Africa South Africa 725 South Africa (pre-Union) South Africa (pre-Union) 36 Orange Free State Orange Free State 6 Greece Greece 7.093 Greece (ancient) Greece (ancient) 6.643 Arkadia Arkadia 157 Orchomenos of Arcadia Orchomenos of Arcadia 5 Boeotia Boeotia 166 Orchomenos of Boeotia Orchomenos of Boeotia 16 Crusader and Christian states in the Eastern Mediterranean Crusader and Christian states in the Eastern Mediterranean 207 Frankish Greece Frankish Greece 38 Order of the knights of Rhodes Order of the knights of Rhodes 11 United States United States 1.325 United States (pre-federal and private/territorial) United States (pre-federal and private/territorial) 143 Oregon gold  Oregon gold 3 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Eastern Hispania Ulterior Eastern Hispania Ulterior 16 Oretani people Oretani people 14 City of Kastilo City of Kastilo 11 City of Sisapo City of Sisapo 1 Iltiraka Iltiraka 1 Labini Labini 1 Peninsular Northeast Peninsular Northeast 25 Lobetani people Lobetani people 1 Orosi Orosi 1 Greece Greece 7.093 Greece (ancient) Greece (ancient) 6.643 Thraco-macedonian region Thraco-macedonian region 21 Orreskioi Orreskioi 3 Thrace Thrace 402 Orthagoreia Orthagoreia 2 Thessaly Thessaly 533 Orthe Orthe 3 Caria Caria 221 Orthosia Orthosia 1 Italy Italy 37.242 Rome Rome 33.420 Roman provinces Roman provinces 1.269 Tarraconensis Tarraconensis 56 Osca Osca 1 Osicerda Osicerda 1 France France 8.042 Gaul Gaul 312 Gallia Armorica Gallia Armorica 87 Osismii Osismii 8 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Middle Ebro Middle Ebro 80 Laietani people Laietani people 8 Oskumken Oskumken 1 Western Hispania Ulterior Western Hispania Ulterior 49 Cunetes Cunetes 2 Osonuba Osonuba 1 Italy Italy 37.242 Rome Rome 33.420 Roman provinces Roman provinces 1.269 Osroene Osroene 2 Edessa Edessa 2 Baetica Baetica 77 Osset Osset 4 Ostrogothic Kingdom Ostrogothic Kingdom 65 City of Ravenna City of Ravenna 2 City of Rome City of Rome 5 Ostrogothic Kingdom Ostrogothic Kingdom 58 Georgia Georgia 383 Iberia (ancient) Iberia (ancient) 258 Western Hispania Ulterior Western Hispania Ulterior 49 Tartessii people Tartessii people 6 Ostur Ostur 1