I have polygons shapefile in which some of the polygons have same attributes as seen below:-

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In QGIS, how do I merge the polygons having the same attributes into one polygon?

In other words, am looking for a way to merger polygons/attribute of the same layer, that is similar way of merging vector layers found at: Vector >> Data Management Tools >> Merge Vector Layers

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You can use the Singleparts to Multiparts in the Vector Geometry tools section of the processing toolbox to do this. It will prompt you for the input layer (from a dropdown list) and the Unique ID field (Ward Code) and you can specify an output file name.


If I understand your question right you can use the 'Dissolve Tool' in 'Geoporcessing Tools' in QGIS.

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"Bayelsa Wards" would be your 'Input vector layer' and "Ward code" the 'Dissolve field'.

  • In QGIS 2.16 on windows you will have a 'Dissolve all" check box which you will need to turn off. Then select the dissolve field as in @poellinf 's answer – Martin Hügi Mar 25 '17 at 9:55
  • @MartinHügi thank you for the additional information. To complete my answer, I'm using QGIS 2.18.0 on MacOS 10.11.6 – blabbath Mar 25 '17 at 10:32
  • Ok, thanks for your time. However, @iant's reply below did exactly what I wanted (I wanted multiple polygons to share the same attribute). So "Singleparts to Multiparts" is what I wanted not "Dissolve". – userPyGeo Mar 26 '17 at 16:07

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