Since 1956, a top divisional New South Wales based league has been contested annually in various forms, with its early days remembered as Division One, as well as the Ampol Cup which ran as state based competitions until the formation of a national league in Australia being the National Soccer League which began in 1977. Today, many of the clubs are former national teams from the NSL, including Sydney Olympic and APIA Leichhardt Tigers with these clubs, and many others, being rejected from the revamped national competition in 2004, the A-League after the demise of the NSL forcing the teams once again into the state leagues. During the 1990s the highest level of football in New South Wales was known as the Super League, which today is the second-tier level of football in NSW.
In 2001, the top football divisions were revamped with the highest level of football being named the Premier League and the Winter Super League being the second. 2005 saw the return of the New South Wales NSL giants in Sydney Olympic, Sydney United 58, Wollongong Wolves (now South Coast Wolves) and Marconi Stallions which arguably brought the better days of a state league competition which many consider one grade lower than the A-League.
In 2013 the National Premier Leagues was announced and would rebrand the premier league in each state under a single banner, with the NSW Premier League rebranded as the National Premier Leagues NSW.
The top five sides at the end of the season compete in the Championship Series. The Championship Series consists of six games, whereby the five teams competing are whittled down to just two. The teams are seeded upon their entry into the Championship Series according to their final position on the ladder. The final two teams compete in the Grand Final, where a NSW Premier League Champion is decided.
First Week – Preliminary Semi-Final – 2nd vs 3rd + Elimination Semi-Final – 4th vs 5th
Second Week – Major Semi-Final – 1st vs Winner PSF + Minor Semi-Final – Loser PSF vs Winner ESF
Third Week – Preliminary Final – Loser of MJF vs Winner of MNS
Final Week – Grand Final – Winner of MJF vs Winner of PF