| Alhambra - Kirishima (Kagoshima), Established 2007 |
| Anaheim - Mito (Ibaragi), Established 1976 |
| Brea - Hanno (Saitama), Established 1981 |
| Burbank - Ota (Gunma), Established 1984 |
| Carlsbad - Futtsu (Chiba), Established 1988 |
| Carson - Soka (Saitama), Established 1979 |
| Chula Vista - Odawara (Kanagawa), Established 1981 |
| Corona - Gotsu (Shimane), Established 2004 |
| Culver City - Kaizuka (Osaka), Established 1965 |
| Encinitas - Amakusa (Kumamoto), Established 1988 |
| Escondido - Itoshima (Fukuoka), Established 1993 |
| Fullerton - Fukui (Fukui), Established 1989 |
| Gardena - Ichikawa (Chiba), Established 1962 |
| Glendale - Higashi Osaka (Osaka), Established 1960 |
| Glendora - Moka (Tochigi), Established 1988 |
| Hemet - Kushimoto (Wakayama), Established 1974 |
| Hemet - Marumori (Miyagi), Established 1990 |
| Huntington Beach - Anjo (Aichi), Established 1982 |
| Irvine - Tsukuba (Ibaraki), Established 1989 |
| La Mirada - Isehara (Kanagawa), Established 1981 |
| Lomita - Takaishi (Osaka), Established 1981 |
| Long Beach - Yokkaichi (Mie), Established 1963 |
| Los Angeles - Nagoya (Aichi), Established 1959 |
| Montebello - Ashiya (Hyogo), Established 1961 |
| Monterey Park - Nachikatsuura (Wakayama), Established 1968 |
| Newport Beach - Okazaki (Aichi), Established 1984 |
| Oceanside - Fuji (Shizuoka), Established 1991 |
| Oceanside - Kisarazu (Chiba), Established 1990 |
| Palm Springs - Nikko (Tochigi), Established 1969 |
| Pasadena - Kasukabe (Saitama), Established 1993 |
| Pasadena - Mishima (Shizuoka), Established 1957 |
| Redlands - Hino (Tokyo), Established 1963 |
| Redondo Beach - Itoman (Okinawa), Established 2013 |
| Riverside - Sendai (Miyagi), Established 1957 |
| San Bernardino - Tachikawa (Tokyo), Established 1959 |
| San Diego - Yokohama (Kanagawa), Established 1957 |
| Santa Barbara - Toba (Mie), Established 1966 |
| Santa Monica - Fujinomiya (Shizuoka), Established 1975 |
| Santa Monica - Kizugawa (Kyoto) * friendship city, Established 2016 |
| Temecula - Daisen (Tottori), Established 1994 |
| Torrance - Kashiwa (Chiba), Established 1973 |
| West Covina - Ohtawara (Tochigi), Established 2004 |
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