IV liga is placed at 4th level of Polish football league system until the end of 2007/08 season.

It includes the clubs that played at least one match (even annulled) in IV liga Kuyavia-Pomerania group since 2000/01 season.

Blue colour means that the club plays in IV liga in the current 2021–22 season.

Green colour means that the club plays higher than IV liga in the current 2021–22 season.

Dark grey colour means that the club does not play in any league in the current 2021–22 season.