It covered a portion of western Toronto, Ontario.

Its name comes from the Trinity–Bellwoods area where Trinity College, Toronto was located.

As this northern portion became more populated, it was split off into other ridings.

Its eastern and western boundaries were fairly consistent, stretching from Bathurst Street in the east to Atlantic Avenue in the West.

In 1987, due to the relative decrease in the population of downtown Toronto compared to other areas, this district was merged with Spadina to form Trinity—Spadina.