Zip API US - An API for performing various zip code related lookups

Zip API US now offers county lookups.

There are 2 available endpoints to perform a county lookup based on a given zip code.

Option 1: Get the single primary county record of a given zip code.
Endpoint: /zipcode/47858/?fields=county

Option 2: Get all counties of a given zip code.
Endpoint: /zipcode/county/47858