I am using QGIS 3.10.1, and I am trying to aggregate Census data (polygons) according to another set of polygons (neighbourhood areas that I have drawn). While I am able to clip the Census data to each neighbourhood, the census data polygon boundaries still show within the neighbourhood polygons, and is still separate data.

Does anyone know how I can take all the census polygon data within a neighbourhood boundary and combine it in to one dataset showing averages / sum etc?

  • 1
    A screenshot showing the spatial relation of neighourhoods and census data would be helpful.
    – Erik
    Oct 21, 2020 at 14:06

1 Answer 1


I think that what you need is to do a Spatial Join.

In QGIS you can do it by searching the tool Join attributes by location. There you can select the different layers and specify the statistics you wanna do.

  • Thank you for this! I had read about that function but didn't quite trust it to do what I wanted... but having tried it out it seems that it does! I appreciate your input as it's good to know the right tool to use! :)
    – RJ_mapper
    Oct 22, 2020 at 13:52

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