| Name | Type | Circle | Bench | Formed | Notes |
| Oberbronn | County | | | 1622: Partitioned from Leiningen | 1665: Annexed to Rickingen |
| Oberehnheim | Imperial Free City | | | | |
Obermünster im Regensburg Obermunster in Regensburg | Abbacy | Bav | | | 1500: Bavarian Circle 1793: Council of Princes |
| Obernai | Imperial City | Upp Rhen | | | 1648: Annexed to France |
| Oberried | Provostry | | | | |
| Oberstein | HRE Lordship HRE County | | | | 1682: Line died out |
| Ochsenhausen | 1391: Abbey | Swab | | | 1495: Became "reichsfrei" (territorially independent) 1793: Council of Princes 1803: Secularized 1806: Annexed to Wurttemberg |
| Odenheim | Provostry | Upp Rhen | | | |
| Offenburg | Imperial City | Swab | SW | 1289 | 1803: Mediatized to Baden |
| Olbruck | HRE Lordship | | | | |
Oldenburg Grand Duke of Oldenburg, Heir in Norway, Duke of Schleswig, Holstein, Stormarn, Ditmarshes & Oldenburg, Prince of Lubeck and Birkenfeld, Lord of Jever and Kniphausen" | County 1774: Duchy 1829: Grand Duchy | Low Rhen | PR | 1101 | 1181: Counts obtained HRE Princely rank 1667: Main Oldenburg line died out 1676: To Christian V of Denmark 1773: To Grand Duke Paul of Russia 1871: Joined German Empire |
| Oppeln | Duchy | | | | |
| Orange | 1000s: County 1173: Principality 1376: HRE Principality | Upp Rhen | | 1000s: Split off from Countship of Provence | 1150: Division into 2 princely lines 1289: Lines reunited 1417: To Chalons dynasty 1530: To Nassau dynasty 1660-1665: French occupation 1673-1702: French occupation 1713: To France |
Orange-Nassau See Nassau-Orange | | | | | |
| Orlamünde | County | | | 1032 | 1015: Annexed to Weimar |
| Orlamünde | County | | | 1170: Partitioned from Ballenstädt | Partitioned several times 1411: Annexed to Meißen |
| Orlamünde-Gräfenthal | County | | | 1295: Partitioned from Orlamünde | 1321: Partitioned into Orlamünde-Lauenstein, Orlamünde-Weimar and Orlamünde-Wiehe |
| Orlamünde-Gräfenthal-Lichtenkamm | County | | | 1406: Partitioned from Orlamünde-Lauenstein | 1426: Annexed to Meißen |
| Orlamünde-Lauenstein | County | | | 1321: Partitioned from Orlamünde-Gräfenthal | 1406: Partitioned into Orlamünde-Gräfenthal-Lichtenkamm, Orlamünde-Lauenstein-Schaunforst and Orlamünde-Lichtentanne |
| Orlamünde-Lauenstein-Schaunforst | County | | | 1406: Partitioned from Orlamünde-Lauenstein | 1467: Annexed to Saxe-Wittenberg |
| Orlamünde-Lichtentanne | County | | | 1406: Partitioned from Orlamünde-Lauenstein | 1460: Annexed to Saxe-Wittenberg |
| Orlamünde-Plassenburg | County | | | 1285: Partitioned from Orlamünde-Weimar | 1340: Annexed to Meißen |
| Orlamünde-Weimar | County | | | 1100: Partitioned from Weimar 1139: Annexed to Ballenstädt 1170: Recreated on partition 1365: Annexed to Meißen Leiningen, the name of an old German family, whose lands lay principally in Alsace and Lorraine. ...
Obernai (French: ; Alsatian: Owernah; German: ) is a town and commune in Alsace, France. ...
, Oberried am Brienzersee is a municipality in the district of Interlaken in the canton of Bern in Switzerland. ...
Former abbey church of St. ...
Offenburg is a city located in the state of Baden-Württemberg, Germany. ...
Baden is a historical state in the southwest of Germany, on the right bank of the Rhine. ...
Oldenburg is a historical state in todays Germany named for its capital, Oldenburg. ...
Motto: none Voivodship Opole Municipal government Rada Miasta Opola Mayor Ryszard Zembaczyński Area 96,2 km² Population - city - urban - density 128 800 250 000 1338/km² Founded City rights - - Latitude Longitude 50°40 N 17°56 E Area code +48 77 Car plates OP Twin towns - Municipal Website...
// The Principality of Orange The title originally referred to the sovereign principality of Orange in valley of Rhone in southern France, which was a property of the House of Orange (1544 House of Orange-Nassau). ...
Orlamünde is a town in the Saale-Holzland district, in Thuringia, Germany. ...
The city hall Goethe and Schiller in front of the Deutsche Nationaltheater Weimar is a city in Germany. ...
Orlamünde is a town in the Saale-Holzland district, in Thuringia, Germany. ...
MeiÃen, internationally most known for porcelain, is a town of approximately 35,000 near Dresden on the river Elbe in the State of Saxony in the southern part of eastern Germany. ...
Orlamünde is a town in the Saale-Holzland district, in Thuringia, Germany. ...
MeiÃen, internationally most known for porcelain, is a town of approximately 35,000 near Dresden on the river Elbe in the State of Saxony in the southern part of eastern Germany. ...
Statue of Martin Luther in the main square Wittenberg, officially [Die] Lutherstadt Wittenberg, is a town in Germany, in the Bundesland Saxony-Anhalt, at 12° 59 E, 51° 51 N, on the Elbe River. ...
Statue of Martin Luther in the main square Wittenberg, officially [Die] Lutherstadt Wittenberg, is a town in Germany, in the Bundesland Saxony-Anhalt, at 12° 59 E, 51° 51 N, on the Elbe River. ...
MeiÃen, internationally most known for porcelain, is a town of approximately 35,000 near Dresden on the river Elbe in the State of Saxony in the southern part of eastern Germany. ...
The city hall Goethe and Schiller in front of the Deutsche Nationaltheater Weimar is a city in Germany. ...
MeiÃen, internationally most known for porcelain, is a town of approximately 35,000 near Dresden on the river Elbe in the State of Saxony in the southern part of eastern Germany. ...
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| Orlamünde-Wiehe | County | | | 1321: Partitioned from Orlamünde-Gräfenthal | 1372: Annexed to Meißen |
Orsini and Rosenberg Prince of Orsini and Rosenberg, Baron of Lerchenau and Grafenstein | 1681: HRE Count (Personalist) 1790: HRE Prince (Personalist) | n/a | FR | 1681 | 1200s: Family 1st mentioned 1684: Adopted style of "Orsini-Rosenberg" |
| Ortenau | Landgraviate | | | | |
Ortenburg Count of Ortenburg, Count and Lord of Tambach | 1805: HRE County | | | 1048 | 1141: 1st use of "Count of Ortenburg" 1395: Partitioned into Ortenburg-Altortenburg (extinct 1446), Ortenburg-Dorfbach (extinct 1462) and Ortenburg-Neuortenburg 1417: Imperial estate 1418/19: Line of counts died out; passed to Counts oc Cilli 1500: Bavarian Circle 1805: Ceded to Bavaria |
| Ortenburg-Altortenburg | 1395: County | | | 1395: Partitioned from Ortenburg | 1446: Annexed to Ortenburg-Dorfbach |
| Ortenburg-Carinthia | County | | | 1100s: Created from the Ortenburger and Sponheimian territories in Carinthia | 1660: Annexed to Austria |
| Ortenburg-Dorfbach | County | | | 1395: Partitioned from Ortenburg | 1462: Annexed to Ortenburg-Neuortenburg |
| Ortenburg-Neuortenburg | County | | | 1395: Partitioned from Ortenburg | |
Osnabrück Osnabruck | Bishopric | Low Rhen | EC | 783: Bishopric 1226 | 1793: Council of Princes 1803: Secularized to Hanover 1813: Annexed to Hanover |
| Osterberg | Lordship | | | 1540: Partitioned from Kronburg | 1745: Renamed to Rechberg and Rothenlöwen |
Öttingen Ottingen | 1147: County 1674: HRE Prince | Swab | | 1141 | 1423: Partitioned into Öttingen-Flochberg, Öttingen-Öttingen, Öttingen-Spielberg and Öttingen-Wallerstein 1522: Division into Ottingen-Ottingen and Ottingen-Wallerstein |
| Ottingen-Baldern | | | | | 1798: Line extinct; passed to Ottingen-Wallerstein |
| Öttingen-Flochberg | County | | | 1423: Partitioned from Öttingen | 1549: Annexed to Öttingen-Öttingen |
| Öttingen-Öttingen | County; 1674: Principality | Swab | | 1423: Partitioned from Öttingen | 1731: Line extinct; annexed to Öttingen-Wallerstein |
| Öttingen-Spielberg | County; 1734: Principality | | | 1423: Partitioned from Öttingen-Wallerstein | |
| Öttingen-Wallerstein | County; 1774: Principality | Swab | | 1423: Partitioned from Öttingen | 1623/1694: Division into Ottingen-Baldern, Ottingen-Spielberg, Ottingen-Wallerstein
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| Ottobeuren | Abbacy | | | | |
| Overijssel | Lordship | Burg | | | 1512: Burgundian Circle |