Several member unions offer on-line databases of freelance members:

UK & Ireland: NUJ Freelance Directory

Germany: DJV-Datenbank Freie Journalisten

Sweden: SJF Frilanskatalogen

Finland: Finnish Freelances (go to FREE-LUETTELO)

Norway: Frilansjournalisterne/NJ Jobbautomat

To find a freelance in another country, or one not listed in the directories, contact a journalists' union in that country.
They cannot give out addresses without specific advance permission from the member. Most will be able to forward your message to a member, if you allow enough time.