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

Name	Type	Imperial circle	Imperial diet	History
Überlingen	Imperial City	Swab	SW	1268: Free Imperial City 1803: To Baden
Ulm	Imperial City	Swab	SW	1115: Free Imperial City 1802: To Bavaria 1810: To Württemberg
Umpfenbach	Territory	n/a	n/a	n/a 1773: Purchased by Philipp Freiherr von Gudenus and Valentin Ferdinand Freiherr von Gudenus from Christian Friedrich Carl Graf zu Castell-Remlingen^[1] June 1, 1805: Purchased by Ferdinand von Trauttmansdorff from Ferdinand Freiherr von Gudenus ^[2]
Unterwalden	Imperial Valley	n/a	n/a	Divided into Nidwalden and Obwalden from an early date 1173: To Counts of Habsburg 1291: Became a founding member of the Swiss League 1324: Imperial immediacy By 1350: Permanent division into Obwalden and Nidwalden 1648: Left Empire as member of Swiss Confederation
Upper Alsace (Sundgau; Oberelsaß)	Landgraviate	n/a	n/a	1130: To Habsburg 1469: Sold to Burgundy 1477: To the Burgundian Netherlands 1516: To Austria 1648: To France
Upper Bavaria (Oberbayern)	Duchy	n/a	n/a	1255: Partitioned from Bavaria 1314: Partitioned into the Palatinate and itself 1340: Renamed to Bavaria 1349: Partitioned from Bavaria 1363: Extinct; to Bavaria-Landshut
Upper Salm See: Salm in the Vosges County
Urach	County	n/a	n/a	1040: First mentioned; brother of Achalm c. 1080: First use of title Count of Urach 1098: Acquired Achalm 1218: Acquired Freiburg 1250: Partitioned into Freiburg, itself and Fürstenberg 1261: Extinct; to Fürstenberg 1265: Sold to Württemberg
Uri	Imperial Valley	n/a	n/a	853: To Fraumünster Abbey as part of Swabia 12th Century: To Zähringen 1218: To Habsburg 1231: Free Imperial Valley 1291: Became a founding member of the Swiss League 1648: Left Empire as member of Swiss Confederation
Ursberg	Abbacy	Swab	SP	1126-8: Founded 1143: Imperial immediacy 1803: To Bavaria
Ursin von Rosenberg See: Orsini-Rosenberg	Principality
Utrecht	Bishopric	Low Rhen	n/a	695: Diocese established 1024: HRE Prince of the Empire 1528: Secularised as the Lordship of Utrecht; to the Spanish Netherlands
Utrecht	Lordship	Burg	n/a	1528: Bishopric of Utrecht secularised; to the Spanish Netherlands 1548: Transferred to the Burgundian Circle 1579: Dutch Revolt against Spain 1648: Left the Empire as part of the Netherlands
Uznach	Lordship 1209: County	n/a	n/a	12th Century: To Rapperswil 1195: To Toggenburg 1209: HRE Count 1436: To Raron; disputed by Zürich 1469: Sold to Schwyz and Glarus in condominium 1648: Left the Empire as part of Switzerland