ition-eng.cfm?ID=geo014" class="external-link">Dissemination
block</a> (DB) level data is available for the 2001-2021 datasets. DBs
are essentially city blocks, bounded by intersecting streets and
therefore are largely the product of road networks at the time of the
census. The geographies and identification codes of DBs are not
necessarily stable over time. DBs are split whenever they intersect with
boundaries of higher geographic levels in such a way as to ensure that
they can be aggregated upwards precis