Ziptastic
HTTPS CORS ? Free
Get the country, state, and city of any US zip-code
API Endpoint
https://ziptasticapi.com/More Geocoding APIs
Geolocate website visitors from their IPs
HTTPS CORS apiKey
Actinia is an open source REST API for geographical data that uses GRASS GIS
HTTPS CORS ? apiKey
Get all administrative divisions of a country
HTTPS CORS Free