Service Delivery Areas (SDAs) are geographies intended to support service planning and delivery by providing service providers with data that is relevant to the local geographies they serve. SDAs are comprised of census tracts (2016 Census) and have varying population thresholds for each municipality.
SDAs are generally neighbourhood sized, but are not neighbourhood boundaries. They attempt to capture logical units for delivering services to the public in a local manner, such as child care and early years services. The population thresholds, where an SDA is split, is as follows: Mississauga - 20,000, Brampton - 15,000 and Caledon - 5,000.