OpenCodeDev 

A C# port of the RestCountries Java API, fully compatible with the original JSON structure, adapted for ASP.NET dependency injection, and providing country data, including time zones, languages, currencies, and... More information

An additional package, recommended for server use only, dependent on the C# RestCountries port, providing versioned country data for instant access and easy installation.

An additional package, dependent on the C# RestCountries port, providing versioned country data files (the package version matches the JSON version available) for instant access and easy installation.