NSW Boundary Concordance Database Service

NSW Boundary Concordance


Four concordances have been calculated for NSW boundaries.<b>LGA_FederalElectoralDivision_concordance</b>
The dataset shows the relationship between LGA boundaries and Federal Electoral Divisions. <i>area_ratio</i> attribute indicates the portion by area of the LGA within each Federal Electoral Division area (a value of 1 indicates the LGA is entirely within the given Federal Electoral Division). Likewise, <i>population_ratio_2021</i> attribute indicates the portion by population of the LGA within each Federal Electoral Division area.  
<b>LGA_StateElectoralDistrict_concordance</b>
The dataset shows the relationship between LGA boundaries and State Electoral Districts. <i>area_ratio</i> attribute indicates the portion by area of the LGA within each State Electoral District area (a value of 1 indicates the LGA is entirely within the given State Electoral District). Likewise, <i>population_ratio_2021</i> attribute indicates the portion by population of the LGA within each State Electoral District area.  
<b>postcode_LGA_concordance</b>
The dataset shows the relationship between postcodes and LGA boundaries. <i>area_ratio</i> attribute indicates the portion by area of the postcode within each LGA area (a value of 1 indicates the postcode is entirely within the given LGA). Likewise, <i>population_ratio_2021</i> attribute indicates the portion by population of the postcode within each LGA area. Postcode boundary is not a standard Spatial Service dataset. It's been derived using suburb that is maintained by Spatial Service. The result is indicative. Where postcode and LGA boundaries do not match exactly, very small percentages might occur. 
<b>suburb_LGA_concordance</b>
The dataset shows the relationship between suburbs and LGA boundaries. <i>area_ratio</i> attribute indicates the portion by area of the suburb within each LGA area (a value of 1 indicates the suburb is entirely within the given LGA). Likewise, <i>population_ratio_2021</i> attribute indicates the portion by population of the suburb within each LGA area. A <i>population_ratio_2021</i> total of 0 for a suburb indicates there is no population estimated in the suburb per the methodology used. 
Caveats:
<ul><li>Spatial Service does not have access to official postcode boundary. It has been derived from ‘suburb’.</li><li>There are a lot of small areas. These are slithers. It can occur where boundaries overlap or do not align.</li><li>Due to rounding, ratios for a given location may not total 1.</li><li>Depending on the software engine, it is possible to get different results for the same operation.</li><li>Population and population ratios have been estimated from 2021 Census mesh block counts (Australian Bureau of Statistics). Population ratios are indicative only and will not reflect any developments nor population changes since August 2021.</li></ul>

Related resource

An excel table of Suburb and LGA percentage area split is available here: <a href="https://portal.spatial.nsw.gov.au/client/services?id=77be870873944636a94adf2d82716baa&amp;mode=view">Suburb and LGA Percentage - Spatial Collaboration Portal</a>
Metadata 
Content TitleNSW Boundary ConcordanceContent TypeHosted Feature LayerDescriptionThe NSW Concordance datasets are a collection of selected boundaries and their spatial relationships to one another. Selected boundary concordances in this dataset include:<ul><li>Ratios of Suburbs in Local Government Areas</li><li>Ratios of Postcodes in Local Government Areas</li><li>Ratios of Local Government Areas in State Electoral Districts</li><li>Ratios of Local Government Areas in Federal Electoral Divisions</li></ul>Ratios area calculated for areas and populations (indicative only). These can differ greatly and are appropriate for different applications. For example, the suburb of Aberdeen is split between Muswellbrook and Upper Hunter LGAs. The area ratios between the LGAs are 0.3888 / 0.6112 and the population ratios are 0.0133 / 0.9867, respectively. So, while a third of the suburb is physically located in Muswellbrook LGA, nearly the entire suburb population is in Upper Hunter LGA.Update frequencies vary for each dataset based on boundary changes and Census releases.Initial Publication Date20/01/2026Data Currency01/01/3000Data Update FrequencyOtherContent SourceNSW Administrative Boundaries Theme and Australian Bureau of StatisticsFile TypeESRI File Geodatabase (*.gdb)Attribution© State of New South Wales (Spatial Services, a business unit of the Department of Customer Service NSW). For current information go to <a href="https://portal.spatial.nsw.gov.au/portal/home/item.html?id=e669f213174d4aeb8b59234fccb15737">spatial.nsw.gov.au</a>Data Theme, Classification or Relationship to other DatasetsAccuracySpatial Reference System (dataset)GDA2020Spatial Reference System (web service)EPSG:7844WGS84 Equivalent ToGDA2020Spatial ExtentFull StateContent LineageFor additional information, please contact us via the <a href="https://customerhub.spatial.nsw.gov.au/servicedesk/customer/portals">Spatial Services Customer Hub</a>Data ClassificationUnclassifiedData Access PolicyOpenData QualityFor additional information, please contact us via the <a href="https://customerhub.spatial.nsw.gov.au/servicedesk/customer/portals">Spatial Services Customer Hub</a>Terms and ConditionsCreative CommonsStandard and SpecificationData CustodianDCS Spatial Services346 Panorama AveBathurst NSW 2795Point of ContactPlease contact us via the <a href="https://customerhub.spatial.nsw.gov.au/servicedesk/customer/portals">Spatial Services Customer Hub</a>Data AggregatorDCS Spatial Services346 Panorama AveBathurst NSW 2795Data DistributorDCS Spatial Services346 Panorama AveBathurst NSW 2795Additional Supporting Informationattribute values for <i>*_partial_area</i> and <i>*_total_area </i>are measured in square kmTRIM Number

Tags: ABS, BOUNDARIES, LGA, State Electoral District, administrative boundaries
Organization: Spatial Services (DCS)