The Croatian Fourth league (Croatian: Prva županijska liga, or commonly 1.

[note 1] The teams in the league are divided into 9 county or inter-county subdivisions, competing in a double round-robin format.

At the end of each season, the bottom teams are relegated to the respective county's Second league, which are under the 2.

ŽNL, while the winners of each league are either promoted directly to the 3.

NL or enter a two-legged playoff to gain promotion.