The sub-series documents the development, administration, and activities of the following YMCA branches: Eastern Communities (which included: Rosemount (Northeastern), Terminal Park Branch, and Montreal East), St-Laurent (Northmount), Côte St-Paul, Hochelaga-Maisonneuve, Mount Royal East, Notre-Dame-de-Grâce (Northwestern), Guy-Favreau, Verdun-Lasalle (Southwestern), Châteauguay and Rive-Sud.
The records include committee minutes, surveys, annual reports, correspondence and publicity materials.