Kaarst - Krefeld
- Kaarst (see Specials: Handschriftencensus Rheinland, vol. 1)
Cath. parish St. Martin
- Kaldenkirchen (Nettetal-) (see Specials: Manuscript Census Rhineland, vol. 1)
Cath. parish St. Clemens
- Kalkar (see Specials: Manuscript Census Rhineland, vol. 1)
Cath. parish St. Nikolai
City Archives
- Kamp-Lintfort (see Specials: Handschriftencensus Rheinland, Vol. 1)
Order Museum (European Meeting Place at Kamp Abbey)
Catholic parish of Our Lady Abbey Church
- Karlsruhe
State Library
- Kassel
University Library - State Library and Murhard Library
- Kempen (see Specials: Handschriftencensus Rheinland, vol. 1)
Cath. parish St. Mariae Geburt
- Kempten
Church library near St. Mang
- Kerpen (see Specials: Manuscript Census Rhineland, Vol. 1)
Cath. parish St. Martinus Kerpen-Sindorf: Cath. parish St. Mary Queen
- Kevelaer (see Specials: Manuscript Census Rhineland, Vol. 1)
Oratory
- Kiel
University Library
- Kleve (see Specials: Manuscript Census Rhineland, Vol. 1)
Museum Haus Koekkoek City Archives
- Koblenz
Görres-Gymnasium (deposit in state main archive)
State main archive
Rhenish State Library, City Archives, City Library (see Specials: Databases, Manuscript Census RLP)
- Cologne
Cathedral and Diocesan Archives
Archbishop's Diocesan and Cathedral Library
Historical Archive of the City
Library of the Hochschule für Musik (see Specials: Manuscript Census Rhineland, Vol. 1)
Archbishop's Diocesan Museum, Historical Archive of the Archdiocese, Cath. Parish of St. Kunibert, Church Association of the Protestant Parishes, Protestant Library, Schnütgen Museum, University and City Library, Wallraf-Richartz Museum / Ludwig Collection (see Specials: Manuscript Census Rhineland, Vol. 2)
- Königswinter (see Specials: Manuscript Census Rhineland, vol. 2)
Cath. parish St. Remigius
- Kranenburg (see Specials: Manuscript Census Rhineland, Vol. 2)
Cath. parish of St. Peter and Paul
- Krefeld (see Specials: Manuscript Census Rhineland, Vol. 2)
Gymnasium am Moltkeplatz Private property
