Until 1928, its seat was located in the city of Gdynia, and was since then moved to Wejherowo.

Additionally, the seat of the county had been transferred from Gdynia to Wejherowo.

[8] On 1 September 1939, the Nazi Germany had invaded Poland, conquering area that included the county.

As such it had been replaced by the Maritime District, located within the Region of Danzig, Reichsgau Danzig-West Prussia.

[9][10] The county had been reestablished in 1945, following the area being reconquered by the Red Army of the Soviet Union, and given under Polish administration of the Provisional Government of the Republic of Poland.