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I have searched online for almost a week and can not find an answer to my issue.

I need to generate polygons from street borders in a given city.

I have downloaded data from openstreetmaps and imported it into QGIS.

Is there a way to generate polygons and use streets as borders?

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There's a link Create polygon layer from polyline layer that might help on how to do this in QGIS.

This post mentions dangling lines (lines that don't form a complete boundary) which may or may not be important to you.

If you are after a single polygon that covers all of your roads (guaranteed) then consider a convex hull.

The QGIS documentation gives an exercise that might illuminate.

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