Does Slovenia have an ISO country code?

Answer 1

No. Many countries, prominently Russia, still recognize Kosovo as part of Serbia.

See http://www.iso.org/iso/country_codes/iso_3166_code_lists/english_country_names_and_code_elements.htm

Answer 2

Kosovo doesn't have an ISO country code because its declaration of independence from Serbia is still not universally recognized. In particular, Russia does not recognize Kosovo, and has opposed giving Kosovo any of the trappings of an independent nation unless an agreement can be reached between the governments of Kosovo and Serbia.

Answer 3

Yes, Slovenia's ISO 3166-1 country code is SI.

Slovenia's telephone country code is +386.