|Ordered||14 Oct 1941|
|Laid down||15 May 1943||F Schichau GmbH, Danzig (werk 1574)|
|Launched||9 Dec 1943|
|Commissioned||17 Feb 1944||Oblt. Heinrich Mäuerler|
|Successes||No ships sunk or damaged|
Scuttled on 5 May 1945 in Gelting Bay. Wreck broken up.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-1204 did not suffer any casualties (we know of) until the time of her loss.