Archivfuerer Schleswig-Holstein - Archive und ihre Bestaende. Link to open access edition that lists addresses, phone and fax numbers, and web addresses of various archives in Schleswig-Holstein. A brief history of the archive is given with a brief description of some of the holdings of each archive.
Addresses of parish archives: Archiv Nordkirche
Landesarchiv Bibliotek Catalog: https://shfam.de/bibliothek
Dithmarschen Kirchenkreisarchiv
Stadtarchiv Friedrichstadt: http://www.archiv-friedrichstadt.de/ This archive has an online index to newspaper holdings covering the years 1850 to the 1890s. It also has an online Mennonite name index and a complete census transcription of the 1803 and the 1840 census.
Search "Findbuch" Uni-Hamburg
See Family History tips for State Archives of Hamburg: https://www.hamburg.de/bkm/familienforschung/4307636/tipps-fuer-die-familienforschung/#anker_3
Archive Lübeck-Lauenburg: http://www.kk-ll.de/arbeitsfelder/115