 Aquileia (UD): Piran (Slovenia), since 1977; Maria Saal (Klagenfurt-Land, Carinthia, Austria), since 2001 |
| Bagnaria Arsa (UD): Sainte Livrade Sur Lot (France), since 2005 |
| Bordano (UD): Alajuela (Costa Rica), since 2007 |
| Buja (UD): Aprilia (Latina - Lazio - Italy), since 1997; Domont (France), since 2008; Vilsbiburg (Germany), since 2001 |
| Buttrio (UD): Nötsch im Gailtal (Villach - Austria); Noetsch Am Gailtal (Austria), since 2001 |
| Campolongo Tapogliano (UD): Montgiscard (Midi-Pyrénées, France), since 2005 |
| Caneva (PN): Neumarkt-Sankt Veit (Germany) |
| Capriva del Friuli (GO): Treffen (Austria) |
| Cassacco (UD): Glanegg (district of Feldkirchen in Carinthia, Austria), since 1997 |
| Cavazzo Carnico (UD): Bohinj (Slovenia), since 2008 |
| Chions (PN): Villanueva Del Pardilllo (Spain), since 2003; Luisant (France) dal 2002 |
| Chiusaforte (UD): Himmelberg (Austria) |
| Codroipo (UD): Maria Wörth (Austria), since 2001; Braine-Le-Comte (Belgium), since 2004 |
| Colloredo di Monte Albano (UD): Klein St. Paul (Austria), since 2007 |
| Cormons (GO): Friesach (Austria), since 1984; Dobrovo Medana (Slovenia), since 1976 |
| Doberdň del Lago (GO): Ujfeherto (Hungary), since 2009; Bled (Slovenia), since 1998; Prvacina (Slovenia), since 1977 |
| Dogna (UD): Foligno (Perugia-Umbria-Italy) |
| Duino-Aurisina (TS): Ilirska Bistrica (Slovenia), since 1983; Buie d'Istria (Croatia), since 1979 |
| Faedis (UD): Castelltercoll (Spain), since 1998 |
| Fagagna (UD): Murau (Austria), since 2006 |
| Fiume Veneto (PN): Albeck Sirinitz (Austria) |
| Fiumicello (UD): Le Temple Sur Lot (France), since 1999 |
| Flaibano (UD): Bettembourg (Luxembourg), since 1989 |
| Fontanafredda (PN): Saint-Jean (France), since October 1996 |
| Forgaria nel Friuli (UD): Maria Saal (Austria); Grafenstein (Austria) |
| Gemona del Friuli (UD): Foligno (Perugia - Umbria - Italy); Velden (Austria); Laakirchen (Austria), since May 2000 |
| Gonars (UD): Vrhnika (Slovenia), since 1975 |
| Gorizia (GO): Zalaegerszeg (Hungary), since 2014; Avellaneda (Argentina), since 2004; Venlo (Netherlands), since 1965; Lienz (Austria), since 2000; Klagenfurt (Austria), since 1965 |
| Gradisca d'Isonzo (GO): Kastav (Croatia), since 2003; Ibrany (Hungary), since 2004 |
| Grado (GO): Feistritz bei Knittelfeld (Austria); St. Lorenzen (Austria) |
| Latisana (UD): Reichenau Au Der Rax (Austria), since 2005 |
| Lignano Sabbiadoro (UD): Ketchum (United States); Lilienfeld (Austria); Abbazia (Croatia) |
| Malborghetto Valbruna (UD): Feistritz an der Gail (Carinthia-Austria) |
| Manzano (UD): Labin (Croatia), since 1981 |
| Marano Lagunare (UD): Schweighouse sur Moder (France) |
| Mariano del Friuli (GO): Lurnfeld (Austria), since 2006 |
| Medea (GO): Keutschach Am See (Austria); Castelculier (France), since 1977; Vrtojba (Slovenia), since 1980 |
| Moggio Udinese (UD): Moggio (Lecco - Lombardy - Italy); Bromont Lamonthe (Clermont-Ferrand - France) |
| Pasiano di Pordenone (PN): Canton de Fronsac (Aquitaine, France), since 1999 |
| Ragogna (UD): Weitensfeld (Austria); Sainte Bazeille (France) |
| Reana del Rojale (UD): Salagnon (France) |
| Romans d'Isonzo (GO): Schiefling am See (Austria), since 2001; Sempeter-Vrtojba (Slovenia), since 2006 |
| Ronchi dei Legionari (GO): Wagna (Austria), since June 1969; Metlika (Slovenia), since April 1968 |
| San Daniele del Friuli (UD): Altkirch (Haut-Rhin department in Alsace - France); Millstatt (Carinthia - Austria); Hersbruck (Germany), since 2008 |
| San Giovanni al Natisone (UD): Kuchl (Austria); Francavilla Fontana (Brindisi-Puglia-Italy) |
| San Lorenzo Isontino (GO): Pottendorf (Austria) |
| San Vito al Tagliamento (PN): Stadtlohn (Germany); Sankt Veit an der Glan (Carinthia Austria); Nagyatád (Hungary) |
| Tavagnacco (UD): Serrenti (Cagliari - Sardinia - Italy), since April 1997 |
| Treppo Grande (UD): Scheggia e Pascelupo (Perugia - Umbria - Italy) |
| Tricesimo (UD): Mittersill (Austria) |
| Udine (UD): Esslingen am Neckar (Germany), since 1958; Norrköping (Sweden), since 1964; Schiedam (Netherlands), since 1970; Albacete (Spain), since 2002; Villach (Austria), since 1979; Vienne (France), since 1959; Neath Port Talbot (Wales), since 1960 |
| Villa Vicentina (UD): Colpo (France) |
| Villesse (GO): Micheldorf (Austria) |
| Zoppola (PN): St. Georgen am Langsee (Carinthia, Austria); Tonneins (France) |
The sister cities for the towns in Friuli-Venezia Giulia, the cooperative agreements with european and other towns all over the world
