The Bundesstraße 204 was a former German federal road or Bundesstraße that served as a link between northwest–southeast route, connecting Heide, Albersdorf, Hanerau-Hademarschen, Schenefeld and Itzehoe in western Schleswig-Holstein.

The road was completely downgraded due to the construction of the A 23 motorway.

Then it crosses the Kiel Canal at the Grünenthal High Bridge.

Afterwards passes the towns of Hanerau-Hademarschen, Gokels, Warringholz and Schenefeld where it had connections with the B 430.

[2] The B 430 didn't run here before the downgrade of the B 204 This junction is now part of the A 23 motorway