ISO 3166-1 alpha-2</a> format, for example "US". For backward compatibility, a 3-letter <a href=https://schema.org/"https://en.wikipedia.org/wiki/ISO_3166-1_alpha-3">ISO 3166-1 alpha-3</a> country code such as "SGP" or a full country name such as "Singapore" can also be used." />
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addressCountry

A Schema.org Property
The country. Recommended to be in 2-letter ISO 3166-1 alpha-2 format, for example "US". For backward compatibility, a 3-letter ISO 3166-1 alpha-3 country code such as "SGP" or a full country name such as "Singapore" can also be used.

Values expected to be one of these types

Used on these types

Source

https://github.com/schemaorg/schemaorg/issues/2506