If you are in Slovenia then the US embassy in Slovenia would be able to issue you as an American citizen a passport, register the birth of your child or your marriage. The embassy can also issue non-immigrant visas and visitor visa’s however the marriage visa and fiancee visa to start with an application to the USCIS in the US. We have listed their contact details and a map to the US embassy in Slovenia which is inÂ Ljubljana below.
US Embassy in Slovenia
Hours are from 08:00 to 17:00, Monday through Friday, except holidays.