The St. John's Jr. Capitals played in the St. John's Junior League in the 1960s and 1970s. The league was mostly just a town league. When the City went to send it's representative to play for the Veitch Memorial Trophy it would send the Jr. Capitals plus the top all-stars from the St. John's League.
The most notable Jr. Capitals team was the 1972 team who beat the Corner Brook Jr. Royals and then the Gander Jr. Flyers to win the first ever Junior A championship of Newfoundland. This gained them the right to compete nationally for the the Centennial Cup by entering the 1972 Hewitt-Dudley Memorial Trophy playdowns. They would get put out by the New Brunswick Junior Hockey League's Moncton Beavers.
In 1973-74, the Jr. Capitals put a permanent team in the Newfoundland Junior A Hockey League. This would only last for one season.
In 1980, with the advent of the St. John's Junior Hockey League, the need for the Jr. Capitals would disappear and so did the team. Nowadays, both the Avalon Jr. Capitals and St. John's Jr. Caps proudly wear the Jr. Capitals name in the SJJHL.