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zipcodestack looks up, validates and searches postal codes in 182 countries: city, state, coordinates, distances and radius search, as JSON.
/v1/search documentation International postal code API All documentation
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GET https://api.zipcodestack.com/v1/search?codes=10001&country=us
{
"results": {
"10001": [{
"postal_code": "10001",
"country_code": "US",
"latitude": 40.7484,
"longitude": -73.9967,
"city": "New York",
"state": "New York",
"state_code": "NY",
"province": "New York"
}]
}
}