The Structure has three hierarchical levels above SA1 comprising in ascending order: Urban Centres and Localities (UCLs), Section of State Range (SOSR) and Section of State (SOS). UCLs can cross State or Territory (S/T) boundaries; the Structure therefore does not aggregate to S/T although where a UCL is bisected by a S/T boundary, each portion of the UCL is separately identified.
The UCL/SOS structure covers the whole of Australia without gaps or overlaps
From the Mesh Block level the complete list of spatial units in this structure are:
For more information regarding the Mesh Blocks and SA1s please refer to Australian Statistical Geography Standard (ASGS): Volume 1 - Main Structure and Greater Capital City Statistical Areas, July 2011
(cat. no. 1270.0.55.001).