[1] St Marys United RUFC would play Rugby Union on a Saturday and back up again on a Sunday and play Rugby League against teams from the Sydney Competition on the paddocks where the St Marys High School is situated today.

The club had now to decide on its immediate future as it had no choice but to look for another venue to play Rugby League and found a site where the Target Shopping Centre is situated today.

In spite of that the Junior League continues to become stronger especially over the past 10 years winning a record 11 Premierships in 2004 and again in 2007.

[1] On 26 September 2016, St Marys made the Ron Massey Cup Grand Final against Mount Pritchard Mounties but lost the match 36–16.

[3] On 24 September 2017, St Marys defeated Mounties to win the Sydney Shield competition in the grand final.

[4] In 2018, St Marys made the Ron Massey Cup grand final against defending premiers the Wentworthville Magpies but were defeated 38–4.

[6] On 4 September 2022, St Mary's won the 2022 Sydney Shield competition, defeating Brothers Penrith 36-12 in the grand final.

On 3 September 2023, St Mary's defeated Wentworthville 40-12 to win the Ron Massey Cup Grand Final.