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couldn’t the OP use the same method to determine accuracy that they used to compare providers?

it doesn’t need to be an accurate decider, just “good enough” in a majority of cases.

The methodology used to determine accuracy involved loading GIS data on all property in a given county. Therefore building a nation-wide accuracy map using that methodology would, by necessity, involve loading all property data nation-wide. And if you had all property data nation-wide, you wouldn't need a reverse geocoder. You'd have one.

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