Hi,
Unfortunately that is not possible, or at least not yet. WordPress does not have any geolocation API that I could be able to use to make search queries on. There are many different GEO plugins, but all use different storage methods, so it is virtually not yet possible to create a solution that would work with most of them. I hope that soon there will be some sort of core feature or at least some sort of standard method that allows this.
Best,Ernest Marcinko
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