| Name | Type | Circle | Bench | Formed | Notes |
Käfernburg Kafernburg | County | | | 10th Century | 1195: Partitioned into Schwarzburg and Schwarzburg-Käfernburg 1302: Counts of Kafenburg died out |
Kaisheim Kaisersheim | Abbacy Prince-Abbacy | Swab | | 1133 | 1757: Imperial immediacy recognized by Bavaria 1793: Council of Princes 1803: Annexed to Bavaria |
Kalenberg — see "Brunswick-Calenberg" | | | | | |
| Kall | County | | | 1488: Partitioned from Manderscheid | 1742: Annexed to Blankenheim 1803: Annexed to France |
| Kammin | 1176: Bishopric 1628: Principality | Upp Sax | | | 1274: Acquired Lubeck city rights 1556: Secularized to Pomerania-Wolgast 1648: To Sweden 1679: Brandenburg |
Käppel Kappel | 1390?: Abbey | | | | 1803: To Nassau 1866: To Prussia |
| Kastelberg | Lordship | | | | |
| Katzenelnbogen | 1095: County 1138: HRE County Landgraviate | | | 1090 | 1138: 1st mention of Counts of Katzenelnbogen 1260: Division into Upper and Lower Katzenelnbogen 1402: Reunited with marriage of Anna of Lower Katzenelnbogen and Johann IV of Upper Katzenelnbogen 1453: Acauired part of County of Diez and Lordship of Eppstein 1479: Line extinct; passed by female succession to Hesse-Marburg |
| Kaufbeuren | Imperial City | Swab | | c1250 | 1803: Annexed to Bavaria |
| Kaufmanns-Saarbrucken | Imperial Free City | | | | To Bishopric of Metz To Lorraine 1661: To France |
Kaunitz HRE Prince of Kaunitz, Count of Rietberg & East Frisia, Lord of Esens, Stadesdorf, Wittmund & Melrich | | | | | 1848: Kaunitz-Rietberg line died out |
Kaysersberg Kaisersberg | Imperial City | Upp Rhen | | | 1648: Annexed to France |
| Kempten im Allgäu | c752: Abbacy 1348/1360: Prince-Abbot | Swab | SW | 1348 | 1793: Council of Princes 1803: Secularized and annexed to Bavaria |
| Kempten im Allgäu | 1289: Imperial Free City | Swab | SW | 1289 | 1803: Mediatized to Bavaria |
| Kerpen | | | | | Acquired by Schasberg |
| Ketterhausen | Lordship | | | | 1803: To Principality of Babenhausen for Fugger house |
Khevenhüller-Metsch Khevenhuller-Metsch Prince of Khevenhüller-Metsch, Count of Hochosterwitz, Baron of Landskron and Wernberg, etc. | 1763: HRE Prince (Personalist) | n/a | SW | 1763 | 1396: 1st mentioned 1519: Division into several lineages |
Kirchberg Burgrave of Kirchberg, Count of Sayn and Wittgenstein, Lord of Farnrode | Burgraviate | | | 1090 | 1799: Annexed to Nassau-Weilburg |
| Klettgau | c1200: County 1325 Landgraviate | Swab | | 981; 1315; 1572 | 1040: Annexed to Habsburg 1282-1408: To Counts of Habsburg-Laufenburg 1408: Passed to Counts of Sulz by marriage 1698: Annexed to Stephanswald-Franconia |
| Klingenmünster | RA | | | | |
| Klosters | High Jurisdiction | | | | |
| Knyphausen | Lordship 1588: Imperial Baron 1658: Imperial County | | | | 1600s: Part of Friesland 1738: To Bentinck 1808: To Kingdom of Holland 1810: To France 1813: To Oldenburg |
| Koblenz | Ballei of the Teutonic Order | | | | 1512: Electoral Rhenish Circle 1793: Council of Princes |
| Koevorden | Lordship | | | | |
| Konigsbronn | Imperial Abbey | | | | |
| Königseck | | | | | |
Königsegg Konigsegg HRE Count of Königsegg & Rothenfels, Baron of Aulendorf & Stauffen, Lord of Ebenweiler & Wald in Swabia | 1192:Lordship 1470:Baron 1629: HRE County | Swab | | 1192 | 1622: Partitioned into Königsegg-Aulendorf and Königsegg-Rothenfels 1663:Reunited with extinction of Konigsegg-Rothenfels. |
| Königsegg-Aulendorf | 1622:Barony 1629:County | | | 1622: Partitioned from Königsegg | 1500: Aulendorf joined Swabian Circle 1806: Mediatised to Wurttemberg |
Königsegg-Rothenfels HRE Count of Königsegg & Rothenfels, Baron of Aulendorf & Stauffen | Lordship 1629: County | | | 1622: Partitioned from Königsegg | 1804: Annexed to Austria |
| Königsfeld (Black Forest) | | | | | |
Konstanz Constance | Bishopric 1200s: Prince-Bishopric | Swab | EC | 911 | 1793: Council of Princes 1802: Divided between Baden and Switzerland 1803: Secularized and annexed to Baden Area: 482 sq. mi.; Pop. 50,000 |
Konstanz Constance | 1192: Imperial Free City | | | 1192 | 780: Constance received municipal rights 1548: Deprived of its privileges as a free and imperial city and given to Austria by Emperor Charles V 1805: Annexed to Baden |
| Konzenberg | Lordship | | | | |
Kornelimünster Kornelimunster | RA | | | | |
| Krautheim | Lordship 1804: HRE Principality of Krautheim and Gerlachsheim | | | | To Salm-Reifferscheid |
| Kreuzlingen | HRE Abbey | | | | |
| Kronburg | Lordship | | | 1460: Partitioned from Aichen | 1540: Partitioned into Osterberg, Schwabeck and Weissenstein |
Krienchingen Criechingen | HRE County | | | | 1697: Line died out To Wied-Runkel |
Küfstein Kufstein | | | | | 1200s: 1st mentioned 1709: |
Küfstein-Greillenstein Count of Kuefstein, Baron of Greillenstein, of Hohenkraen, etc. | 1709: HRE Count (Personalist) | n/a | FR | 1709 | |
| Kulmbach | Lordship | | | | 1057-1234: To Andechs-Meran 1248: To Counts of Orlamunde 1340: To Hohenzollern Burgraves of Nuremberg 1792: To Prussia 1807: French occupation 1810: To Bavaria |
Kyburg Kiburg | County | | | 11th Century | 1414: Annexed to Switzerland |