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I've downloaded us region boundaries from US census bureau, which is a .zip file. I can open to view the file with QGis as follows (4 regions + Alaska): enter image description here

Now I have a dataset containing a lot of data point. Each data point has a pair of latitude and longitude. I want to use these numbers to identify which region a data point belongs to.

How can I do it with QGIS?

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    Just an FYI to facilitate your own research: this process is not really "reverse geocoding". You're looking for a point-in-polygon style of "spatial join". – Richard Law Apr 17 '16 at 8:49
  • Thank you. yep, it's true. How can I extract polygons corresponding to regions? I have the algorithm to check if a point is inside a polygon – lenhhoxung Apr 17 '16 at 8:51
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    Welcome to gis.stackexchange! Please note that a good question on this site is expected to show some degree of research on your part, i.e. what you have tried and - if applicable - code so far. For more info, you can check our faq. – underdark Apr 17 '16 at 11:16
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Finally, MMQGIS plug-in helps me solve the issue. I can now extract polygons, and by using the algorithm from this site, I can make labels for my dataset.

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