Coordinates to postal code

Every result comes from a bundled slice of the GeoNames postal export, downloaded 2026-11-02, CC BY 4.0: 196 codes across 7 countries, a deterministic sample of each country file. That slice is the whole search space, so a nearby code in the full GeoNames dataset can be missing here. Admin divisions are the safer key: a postal code area and your exact point can sit streets apart, and the nearest code never proves where a point actually is. Anything past 50 km gets a warning instead of a confident answer.