List of states in the Holy Roman Empire (O)

This is a list of states in the Holy Roman Empire beginning with the letter O:

Name	Type	Circle	Bench	Formed	Notes
Oberbronn	County				1622: Partitioned from Leiningen 1665: Annexed to Rickingen
Oberehnheim (Obernai)	Imperial City	Upp Rhen			1648: Annexed to France
Obermünster in Regensburg	Abbacy	Bav			1500: Bavarian Circle 1793: Council of Princes
20px Oberried	Provostry
Oberstein	HRE Lordship HRE County				1682: Line died out 1766: the Counts of Limburg-Styrum become the owners of the Lordship of Oberstein
Ochsenhausen	1391: Abbey	Swab			1495: Became "reichsfrei" (territorially independent) 1793: Council of Princes 1803: Secularized 1806: Annexed to Wurttemberg
Odenheim	Provostry	Upp Rhen
21px 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 Lübeck and Birkenfeld, Lord of Jever and Kniphausen"	County 1774: Duchy 1829: Grand Duchy	Low Rhen	PR	1101 est	Before 1180: Part of older Duchy of Saxony, till emperor deposed Henry the Lion 1181: Counts obtained Imperial immediacy at the carve-up of the older Duchy of Saxony 1667: Main Oldenburg line died out 1676: To Christian V of Denmark 1773: To Grand Duke Paul of Russia 1871: Joined German Empire
Orange	11th century: County 1173: Principality 1376: HRE Principality	Upp Rhen		11th century	Split off from Countship of Provence 1150: Division into 2 princely lines 1289: Lines reunited 1417: To Châlons dynasty 1530: To Nassau dynasty 1660-1665: French occupation 1673-1702: French occupation 1713: To France
Orange-Nassau
20px Orlamünde	County			1032	1015: Annexed to Weimar
20px Orlamünde	County			1170	Partitioned from Ballenstädt Partitioned several times 1411: Annexed to Meißen
20px Orlamünde-Gräfenthal	County			1295	Partitioned from Orlamünde 1321: Partitioned into Orlamünde-Lauenstein, Orlamünde-Weimar and Orlamünde-Wiehe
20px Orlamünde-Gräfenthal-Lichtenkamm	County			1406	Partitioned from Orlamünde-Lauenstein 1426: Annexed to Meißen
20px Orlamünde-Lauenstein	County			1321	Partitioned from Orlamünde-Gräfenthal 1406: Partitioned into Orlamünde-Gräfenthal-Lichtenkamm, Orlamünde-Lauenstein-Schaunforst and Orlamünde-Lichtentanne
20px Orlamünde-Lauenstein-Schaunforst	County			1406	Partitioned from Orlamünde-Lauenstein 1467: Annexed to Saxe-Wittenberg
20px Orlamünde-Lichtentanne	County			1406	Partitioned from Orlamünde-Lauenstein 1460: Annexed to Saxe-Wittenberg
20px Orlamünde-Plassenburg	County			1285	Partitioned from Orlamünde-Weimar 1340: Annexed to Meißen
20px Orlamünde-Weimar	County			1100	Partitioned from Weimar 1139: Annexed to Ballenstädt 1170: Recreated on partition 1365: Annexed to Meißen
20px Orlamünde-Wiehe	County			1321	Partitioned from Orlamünde-Gräfenthal 1372: Annexed to Meißen
20px 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	13th century: Family 1st mentioned 1684: Adopted style of "Orsini-Rosenberg"
20px 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	County			1395	Partitioned from Ortenburg 1446: Annexed to Ortenburg-Dorfbach
Ortenburg-Carinthia	County			12th century	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	783: Bishopric 1226: HRE Prince-Bishopric	Low Rhen	EC	783	Before 1180: Part of older Duchy of Saxony, till emperor deposed Henry the Lion 1180: As fief to Tecklenburg at the carve-up of the older Duchy of Saxony After 1648: Osnabrück alternately ruled by a Protestant Administrator and Catholic Prince-Bishop 1793: Council of Princes 1803: Secularized to Hanover 1813: Annexed to Hanover
20px Osterberg	Lordship			1540	Partitioned from Kronburg 1745: Renamed to Rechberg and Rothenlöwen
20px Öttingen	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
20px Öttingen-Baldern					1798: Line extinct; passed to Ottingen-Wallerstein
20px Öttingen-Flochberg	County			1423	Partitioned from Öttingen 1549: Annexed to Öttingen-Öttingen
20px Öttingen-Öttingen	County 1674: Principality	Swab		1423	Partitioned from Öttingen 1731: Line extinct; annexed to Öttingen-Wallerstein
20px Öttingen-Spielberg	County 1734: Principality			1423	Partitioned from Öttingen-Wallerstein
20px Öttingen-Wallerstein	County 1774: Principality	Swab		1423	Partitioned from Öttingen 1623/1694: Division into Ottingen-Baldern, Ottingen-Spielberg, Ottingen-Wallerstein
20px Ottobeuren	Abbacy
Overijssel	Lordship	Burg			1512: Burgundian Circle