 Allumiere (RM): Deutschkreutz (Austria), since 1999; Eglfing (Bavaria - Germany), since 2001; Puçol (Valencia - Spain), since 2006 |
| Anagni (FR): Isle sur la Sorgue (France); Gniezno (Poland); Migdal Haemek (Israel) |
| Anguillara Sabazia (RM): Blanca (Murcia, Spain) |
| Arcinazzo Romano (RM): Santiponce (Spain) |
| Ardea (RM): Rielasingen-Worblingen (Germany) |
| Artena (RM): Alcalà del Rio (Spain) |
| Atina (FR): Basilea (Switzerland); Augusta Raurica (Switzerland); Newton Mass. (United States); Veroli (Frosinone – Lazio - Italy) |
| Bracciano (RM): La Marsa (Tunisia); Viroflay (France) |
| Cassino (FR): Cavarzere (Venice - Veneto - Italy), since 26th April 1998 |
| Castel Gandolfo (RM): Chateauneuf du Pape (France) |
| Ceccano (FR): Cancun (Mexico); Plouzané (Finistère department in Bretagne, France) |
| Celleno (VT): Serock (Poland) |
| Cisterna di Latina (LT): Fort Smith (Arkansas, United States); Grombalia (Tunisia); Punta Umbrìa (Spain) |
| Civitavecchia (RM): Betlemme (Gaza Strip); Amelia (Terni - Umbria - Italy); Nantong (People’s Republic of China); Ishinomaki (Japan) |
| Contigliano (RI): Talarrubias (Spain), since 2007 |
| Coreno Ausonio (FR): Blonie (Masovian, Poland) |
| Fondi (LT): Dachau (Germany), since 1998 |
| Formia (LT): Haninge (Sweden); Santeramo in Colle (Bari - Apulia - Italy); Gracanica (Bosnia); Fleury-les Aubrais (France); Ferrara (Emilia-Romagna - Italy) |
| Frascati (RM): Kortrijk (Belgium); Bonn-Bad Godesberg (Germany); Windsor-Maidenhead (United Kingdom); Saint Cloud (France) |
| Genzano di Roma (RM): Chatillon (France); Mokotov-Varsavia (Poland); Merseburg (Germany) |
| Gerano (RM): Gharb (Gozo - Malta) |
| Greccio (RI): San Donato Val di Comino (Frosinone-Lazio-Italy); Guardea (Terni-Umbria-Italy); Betlemme, since 1992 |
| Minturno (LT): Jyvaskyla (Finland); Stamford (United States); Pilas (Spain) |
| Monte Compatri (RM): Calahorra (La Rioja, Spain) |
| Nettuno (RM): Traunreut (Germany), since October 1973; Corinaldo (Ancona - Marche - Italy), since October 2004 |
| Palestrina (RM): Fussen (Germany); Bièvres (France), since 2007 |
| Pisoniano (RM): Sannat (Malta) |
| Poggio Mirteto (RI): Canejan (France) |
| Poggio Moiano (RI): Montferrand le Chateau (France) |
| Pontinia (LT): Utena (Lithuania); Goro (Ferrara, Emilia Romagna, Italy) |
| Prossedi (LT): Opountion (Greece), since September 2005 |
| Rieti (RI): Ito (Shizuoka, Japan) |
| Rocca Priora (RM): Sohland a.d. Spree (Germany) |
| Roccasecca (FR): Croissy-Beaubourg (Île-de-France, France) |
| San Donato Val di Comino (FR): Greccio (Rieti-Lazio-Italy) |
| Sermoneta (LT): Arborea (Oristano - Sardinia - Italy); San Fulgencio (Spain); Mortegliano (Udine - Friuli Venezia Giulia - Italy); Atalanti (Greece) |
| Sora (FR): Vaughan (Canada); Athis Mons (France) |
| Subiaco (RM): Subiaco (Australia); Ochsenhausen (Germany), since 1989 |
| Supino (FR): Sasd (Hungary), since July 2007; Cirò Marina (Calabria), since May 2007 |
| Tarquinia (VT): Jaruco (La Havana - Cuba); Rabat (Malta) |
| Terracina (LT): Spa (Belgium), since October 1956; Chur (Switzerland), since October 1956; Bougie (Algeria), since October 1956; Bad Mondorf (Luxembourg), since October 1956; Pecs (Hungary), since 1996; Mayrhofen (Austria), since October 1956; Bad Homburg (Germany), since October 1956; Exeter (United Kingdom), since 1988; Jurmala (Latvia), since 1986; Cabourg (France), since October 1956 |
| Vasanello (VT): Asnes (Norway); Dschang (Camerun) |
| Zagarolo (RM): Nelahozeves (Czech Republic); Six Four les Plages (France) |
The sister cities for the towns in Lazio, the cooperative agreements with european and other towns all over the world
