Some of the league's member clubs are fully professional, while others are semi-professional.
The league was formed in line with the introduction of a new six-tier system by the Football Kenya Federation to take effect from the beginning of the 2014 season.
At the end of each season, the club with the most points is crowned champion.
If there is a tie for the championship, for relegation, or for qualification to other competitions, a playoff match at a neutral venue decides rank.
Similarly, the bottom two teams of the National Super League are relegated to Division One, with the top two teams from both Division One zones promoted in their place.