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I currently am working on a piece of code in Python that takes in a csv file of latitude and longitude coordinates and returns a new csv file with the corresponding county codes. How would I go about linking each coordinate with a county code? I am aware of the reverse_geocoder python package, but this only returns the name of each county. Is there any tool that returns county code?

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If you have the shape definitions for the counties, you can do your own search using a simple point-in-polygon search.

This would be greatly speeded up by using a spatial index, searching the spatial extents (ie. n/s/w/e extents) and then only performing the point-in-polygon when there is an overlap in extents.

Assuming you're in the US and not working with the Aleutians, then you can probably assume Euclidean coordinates for the point-in-polygon. True point-in-polygon on a sphere is more complicated...

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