In the late 90's and early 00's the club began to raise money to fund the building of a state-of-the-art AstroTurf pitch, replacing the old carpet and sand training area.

St John's won their first trophy in the 1950–51 season, with the combination (reserves) winning the Junior Cup, defeating Northern Youth Center 4–3 in the final.

St John's reached the final of the Hospital Cup in the 1952–53 season, losing 6–2 to Braddan.

St John's have won the Captain George Woods Memorial Cup on three occasions, with the first coming in the 1965–66 season.

The 2010–11 season brought St John's there most recent win beating Colby in the final.

St John's United have won the Isle of Man FA Cup twice, in 1971–72 and 1975–76, with club legend Ernie Quayle playing a pivotal role in both finals.

However they were losing finalists in 2002–03 in the Paul Henry Gold Cup and missed out on promotion by one point finishing in third place in Division Two.

The club also have a 112 pitch campsite and motor home berths, with internet and bathroom facilities, which is open from April to September.