| 1 | Birmingham | Alabama | Maebashi, Japan |
| 1 | Mobile | Alabama | Málaga, Spain |
| 1 | Montgomery | Alabama | Pietrasanta, Italy |
| 3 | Tuscaloosa | Alabama | Narashino, Japan; Schorndorf, Germany; Sunyani-Techiman, Ghana |
| 7 | Anchorage | Alaska | Whitby, England; Chitose, Japan; Magadan, Russia; Incheon, Korea; Darwin, Australia; Tromsø, Norway; Harbin, China |
| 1 | Fort Smith | Arkansas | Cisterna, Italy |
| 1 | Hot Springs | Arkansas | Hanamaki, Japan |
| 5 | Little Rock | Arkansas | Changchun, China; Hanam, South Korea; Kaohsiung Municipality, Taiwan; Mons, Belgium; Province of Ragusa, Italy |
| 1 | North Little Rock | Arkansas | Uiwang, South Korea |
| 1 | Subiaco | Arkansas | Subiaco, Australia |
| 2 | Alameda | California | Arita, Japan; Wuxi, China |
| 1 | Alhambra | California | Rizhao, China |
| 3 | Anaheim | California | Mito, Japan; Orlando, Florida; Vitoria-Gasteiz, Spain |
| 2 | Antioch | California | Chichibu, Japan; Lázaro Cárdenas, Mexico |
| 1 | Arcadia | California | Newcastle, Australia |
| 1 | Arcata | California | Camoapa, Nicaragua |
| 1 | Azusa | California | Zacatecas, Mexico |
| 7 | Bakersfield | California | Bucheon, South Korea; Cixi, China; Amritsar, India; Darwin, Australia; Minsk, Belarus; Santiago de Querétaro, Mexico; Wakayama, Japan |
| 1 | Belmont | California | Namur, Belgium |
| 1 | Benicia | California | Tula, Mexico |
| 13 | Berkeley | California | Blackfeet Nation, United States; Dmitrov, Russia; Gao, Mali; Jena, Germany; León, Nicaragua; Oukasie, South Africa; Palma Soriano, Cuba; Sakai, Japan; San Antonio Los Ranchos, El Salvador; Ulan-Ude, Russia; Uma-Bawang, Malaysia; Yondó, Colombia; Yurok Tribe, United States |
| 3 | Beverly Hills | California | Acapulco, Mexico; Cannes, France; Kuwait City, Kuwait |
| 1 | Big Bear Lake | California | Abtenau, Austria |
| 1 | Brisbane | California | Brisbane, Australia |
| 4 | Burbank | California | Gaborone, Botswana; Incheon, South Korea; Ōta, Japan; Solna, Sweden |
| 1 | Calipatria | California | Jericho, Palestinian Authority |
| 2 | Carlsbad | California | Futtsu, Japan; Karlovy Vary, Czech Republic |
| 3 | Carson | California | La Carlota, Philippines; Sōka, Japan; Wanju, South Korea |
| 1 | Cerritos | California | Loreto, Mexico |
| 3 | Chula Vista | California | Cebu City, Philippines; Odawara, Japan; Irapuato, Mexico |
| 1 | Coloma | California | Clunes, Australia |
| 2 | Compton | California | Apia, Samoa; Onitsha, Nigeria |
| 1 | Concord | California | Kitakami, Japan |
| 4 | Corona | California | Fuxin, China; Gōtsu, Japan; Ocotlán, Mexico; Silkeborg, Denmark |
| 1 | Costa Mesa | California | Okazaki, Japan |
| 1 | Covina | California | Xalapa, Mexico |
| 5 | Culver City | California | Iksan, South Korea; Kaizuka, Japan; Lethbridge, Canada; Uruapan, Mexico; Yanji, China |
| 3 | Cupertino | California | Hsinchu, Taiwan; Toyokawa, Japan; Bhubaneswar, India |
| 1 | Daly City | California | Quezon City, Philippines |
| 3 | Davis | California | Inuyama, Japan; Qufu, China; Uman, Ukraine |
| 1 | Delano | California | Arida, Japan |
| 1 | Dos Palos | California | Bastogne, Belgium |
| 1 | Dublin | California | Bray, Ireland |
| 1 | East Palo Alto | California | Grahamstown, South Africa |
| 3 | El Cajon | California | Comondu, Mexico; Goulburn, Australia; Sulzfeld, Germany |
| 3 | El Monte | California | Marcq-en-Barœul, France; Yongkang, Taiwan; Zamora, Mexico |
| 1 | Elk Grove | California | Concepción de Ataco, El Salvador |
| 1 | Encinitas | California | Hondo, Japan |
| 1 | Escondido | California | Maebaru, Japan |
| 2 | Eureka | California | Kamisu, Japan; Nelson, New Zealand |
| 1 | Fairfield | California | Nirasaki, Japan |
| 2 | Folsom | California | Crespano del Grappa, Italy; Jiaohe, China |
| 2 | Fremont | California | Elizabeth, Australia; Fukaya, Japan |
| 9 | Fresno | California | Baqubah, Iraq; Kōchi, Japan; Lahore, Pakistan; Mashhad, Iran; Morogoro, Tanzania; Münster, Germany; Taraz, Kazakhstan; Torreón, Mexico; Verona, Italy |
| 3 | Fullerton | California | Fukui, Japan; Morelia, Mexico; Yongin, South Korea |
| 3 | Gardena | California | Huatabampo, Mexico; Ichikawa, Japan; Rosarito Beach, Mexico |
| 6 | Gilroy | California | Angra Do Heroismo, Portugal; Koror, Palau; Monticelli d'Ongina, Italy; Saint-Clar, France; Takko, Japan; Tecate, Mexico |
| 5 | Glendale | California | Higashiōsaka, Japan; Hiroshima, Japan; Kapan, Armenia; Rosarito Beach, Mexico; Tlaquepaque, Mexico |
| 1 | Glendora | California | Moka, Japan |
| 1 | Grass Valley | California | Bodmin, England |
| 2 | Greenfield | California | Guanajuato, Mexico; Oaxaca, Mexico |
| 1 | Gustine | California | Serreta, Portugual |
| 2 | Hayward | California | Funabashi, Japan; Ghazni, Afghanistan |
| 4 | Hemet | California | Cootamundra, Australia; Ebeltoft, Denmark; Kushimoto, Japan; Marumori, Japan |
| 1 | Hercules | California | Tsushima, Japan |
| 1 | Hermosa Beach | California | Loreto, Mexico |
| 1 | Highland | California | Lachin, Azerbaijan |
| 1 | Hollister | California | Takino, Japan |
| 1 | Huntington Beach | California | Anjo, Japan |
| 3 | Inglewood | California | Bo, Sierra Leone; Pedavena, Italy; Port Antonio, Jamaica |
| 3 | Irvine | California | Hermosillo, Mexico; Taoyuan District, Taiwan; Tsukuba, Japan |
| 1 | Irwindale | California | Salvatierra, Mexico |
| 2 | La Habra | California | Eunpyeong-gu, South Korea; San Miguel de Allende, Mexico |
| 1 | La Mirada | California | Isehara, Japan |
| 1 | Larkspur | California | Shangyu, China |
| 3 | Livermore | California | Quetzaltenango, Guatemala; Snezhinsk, Russia; Yotsukaidō, Japan |
| 1 | Livingston | California | Wakami, Japan |
| 2 | Lodi | California | Kofu, Japan; Lodi, Italy |
| 2 | Loma Linda | California | Libertador San Martín, Argentina; Manipal, India |
| 1 | Lomita | California | Takaishi, Japan |
| 5 | Lompoc | California | Cheyenne, Wyoming; Inca, Spain; Lake Placid, Florida; Locarno, Switzerland; Namwon, South Korea |
| 10 | Long Beach | California | Bacolod, Philippines; Guadalajara, Mexico; İzmir, Turkey; Kolkata, India; Manta, Ecuador; Phnom Penh, Cambodia; Qingdao, China; Sochi, Russia; Valparaíso, Chile; Yokkaichi, Japan |
| 4 | Los Altos | California | Greater Bendigo, Australia; Shilin, Taiwan; Syktyvkar, Russia; Rustington, England |
| 25 | Los Angeles | California | Athens, Greece; Auckland, New Zealand; Beirut, Lebanon; Berlin, Germany; Bordeaux, France; Busan, South Korea; Eilat, Israel; Giza, Egypt; Guangzhou, China; Ischia, Italy; Jakarta, Indonesia; Kaunas, Lithuania; Lusaka, Zambia; Makati, Philippines; Mexico City, Mexico; Mumbai, India; Nagoya, Japan; Saint Petersburg, Russia; Salvador, Brazil; San Salvador, El Salvador; Split, Croatia; Taipei, Taiwan; Tehran, Iran; Vancouver, Canada; Yerevan, Armenia |
| 3 | Lynwood | California | Aguascalientes, Mexico; Chihuahua, Mexico; Zacatecas, Mexico |
| 3 | Martinez | California | Dunbar, Scotland; Hanchuan, China; Zacatecas, Mexico |
| 1 | Mendocino | California | Miasa, Japan |
| 2 | Millbrae | California | Albury, Australia; Somoto, Nicaragua |
| 3 | Milpitas | California | Dagupan, Philippines; Huizhou, China; Tsukuba, Japan |
| 4 | Modesto | California | Khmelnytskyi, Ukraine; Kurume, Japan; Vijayawada, India; Vernon, Canada |
| 2 | Montebello | California | Ashiya, Japan; Stepanakert, Nagorno-Karabakh |
| 3 | Monterey | California | Dubrovnik, Croatia; Nanao, Japan; Trapani, Italy |
| 5 | Monterey Park | California | Nachikatsuura, Japan; Quanzhou, China; Yung-ho, Taiwan; Yeongdeungpo-gu, South Korea; Morelia, Mexico |
| 5 | Morgan Hill | California | Headford, Ireland; Mizuho, Japan; San Casciano in Val di Pesa, Italy; San Martín de Hidalgo, Mexico; Seferihisar, Turkey |
| 2 | Mountain View | California | Hasselt, Belgium; Iwata, Japan |
| 3 | Napa Valley | California | Casablanca Valley, Chile; Iwanuma, Japan; Telavi, Georgia |
| 1 | National City | California | Tecate, Mexico |
| 1 | Nevada City | California | Penzance, England |
| 5 | Newport Beach | California | Antibes, France; Cabo San Lucas, Mexico; Okazaki, Japan; Vung Tau, Vietnam; Yeosu, South Korea |
| 1 | Novato | California | Shepparton, Australia |
| 9 | Oakland | California | Agadir, Morocco; Dalian, China; Da Nang, Vietnam; Fukuoka, Japan; Funchal, Portugal; Nakhodka, Russia; Ocho Rios, Jamaica; Santiago de Cuba, Cuba; Sekondi-Takoradi, Ghana |
| 4 | Oceanside | California | A'ana, Samoa; Ensenada, Mexico; Fuji, Japan; Kisarazu, Japan |
| 5 | Ontario | California | Brockville, Canada; East Coast Bays, New Zealand; Guamuchil, Mexico; Mocorito, Mexico; Winterthur, Switzerland |
| 5 | Orange | California | Novo Kosino, Russia; Orange, Australia; Orange, France; Querétaro, Mexico; Timaru, New Zealand |
| 1 | Orinda | California | Tábor, Czech Republic |
| 1 | Oroville | California | Salem, Massachusetts |
| 1 | Palmdale | California | Poncitlán, Mexico |
| 6 | Palo Alto | California | Albi, France; Enschede, Netherlands; Linköping, Sweden; Oaxaca, Mexico; Palo, Philippines; Tsuchiura, Japan |
| 5 | Pasadena | California | Järvenpää, Finland; Ludwigshafen am Rhein, Germany; Mishima, Japan; Vanadzor, Armenia; Xicheng District, China |
| 1 | Pico Rivera | California | San Luis Potosí, Mexico |
| 1 | Pittsburg | California | Shimonoseki, Japan |
| 2 | Pleasant Hill | California | Chilpancingo, Mexico; Merzifon, Turkey |
| 2 | Pleasanton | California | Blairgowrie, Scotland; Tulancingo, Mexico |
| 2 | Redlands | California | Hino, Japan; San Miguel de Allende, Mexico |
| 2 | Redondo Beach | California | Ensenada, Mexico; La Paz, Mexico |
| 2 | Redwood City | California | Colima, Mexico; Zhuhai, China |
| 3 | Richmond | California | Regla, Cuba; Shimada, Japan; Zhoushan, China |
| 3 | Riverbank | California | Fuyang, China; Fürstenfeld, Austria; Tamazula de Gordiano, Mexico |
| 8 | Riverside | California | Cuautla, Mexico; Ensenada, Mexico; Erlangen, Germany; Hyderabad, India; Gangnam, South Korea; Jiangmen, China; Obuasi, Ghana; Sendai, Japan |
| 1 | Rohnert Park | California | Hashimoto, Japan |
| 2 | Rosemead | California | Keelung, Taiwan; Zapopan, Mexico |
| 1 | Roseville | California | Chignahuapan, Mexico |
| 1 | Running Springs | California | Sehmatal, Germany |
| 8 | Sacramento | California | Ashkelon, Israel; Chişinău, Moldova; Hamilton, New Zealand; Jinan, China; Liestal, Switzerland; Manila, Philippines; Matsuyama, Japan; Yongsan-gu, South Korea |
| 3 | Salinas | California | Cebu City, Philippines; Jerecuaro, Mexico; Kushikino, Japan |
| 9 | San Bernadino | California | Herzliya, Israel; Ile-Ife, Nigeria; Kigali, Rwanda; Mexicali, Mexico; Roxas, Philippines; Tachikawa, Japan; Tauranga, New Zealand; Villahermosa, Mexico; Zavolzhye, Russia |
| 1 | San Bruno | California | Narita, Japan |
| 1 | San Carlos | California | Okotoks, Canada |
| 2 | San Clemente | California | San José de Balcarce, Argentina; San Clemente del Tuyu, Argentina |
| 15 | San Diego | California | Alcalá de Henares, Spain; Campinas, Brazil; Cavite City, Philippines; Edinburgh, Scotland; Jalalabad, Afghanistan; Jeonju, South Korea; Leon, Mexico; Perth, Australia; Taichung City, Taiwan; Tema, Ghana; Tijuana, Mexico; Vladivostok, Russia; Warsaw, Poland; Yantai, China; Yokohama, Japan |
| 19 | San Fracisco | California | Abidjan, Côte d'Ivoire; Amman, Jordan; Assisi, Italy; Bangalore, India; Barcelona, Spain; Cork, Ireland; Haifa, Israel; Ho Chi Minh City, Vietnam; Kiel, Germany; Kraków, Poland; Manila, Philippines; Osaka, Japan; Paris, France; Seoul, South Korea; Shanghai, China; Sydney, Australia; Taipei, Taiwan; Thessaloniki, Greece; Zürich, Switzerland |
| 9 | San José | California | Dublin, Ireland; Pune, India; Okayama, Japan; Indore, India; Tainan City, Taiwan; San José, Costa Rica; Veracruz, Mexico; Yekaterinburg, Russia; Kanpur, India |
| 2 | San Leandro | California | Naga City, Philippines; Ribeirao Preto, Brazil |
| 1 | San Luis Obispo | California | Narvacan, Philippines |
| 3 | San Mateo | California | San Pablo City, Philippines; Toyonaka, Japan; Varde, Denmark |
| 1 | San Pedro | California | Manzanillo, Mexico |
| 1 | San Rafael | California | Lonate Pozzolo, Italy |
| 8 | Santa Barbara | California | Dingle, Ireland; Palma de Mallorca, Spain; Puerto Vallarta, Mexico; San Juan City, Philippines; Toba, Japan; Weihai, China; Yalta, Ukraine; Kotor, Montenegro |
| 2 | Santa Clara | California | Coimbra, Portugal; Izumo, Japan |
| 3 | Santa Clara County | California | Florence Province, Italy; Hsinchu County, Taiwan; Moscow Oblast, Russia |
| 2 | Santa Clarita | California | Sariaya, Philippines; Tena, Ecuador |
| 5 | Santa Cruz | California | Alushta, Ukraine; Jinotepe, Nicaragua; Puerto la Cruz, Venezuela; Sestri Levante, Italy; Shingu, Japan |
| 2 | Santa Fe Springs | California | Navojoa, Mexico; Tirschenreuth, Germany |
| 3 | Santa Monica | California | Fujinomiya, Japan; Hamm, Germany; Mazatlán, Mexico |
| 3 | Santa Rosa | California | Cherkasy, Ukraine; Jeju City, South Korea; Los Mochis, Mexico |
| 2 | Saratoga | California | Harlem, New York; Muko, Japan |
| 2 | Sausalito | California | Sakaide, Japan; Vina del Mar, Chile |
| 2 | Sebastopol | California | Chyhyryn, Ukraine; Yamauchi, Japan |
| 1 | Solvang | California | Aalborg, Denmark |
| 7 | Sonoma | California | Chambolle-Musigny, France; Greve in Chianti, Italy; Aswan, Egypt; Penglai, China; Tokay, Hungary; Kaniv, Ukraine; Patzcuaro, Mexico |
| 1 | South El Monte | California | Gómez Palacio, Mexico |
| 4 | South San Francisco | California | Atotonilco, Mexico; Kishiwada, Japan; Lucca, Italy; Pasig City, Philippines |
| 7 | Stockton | California | Asaba, Nigeria; Battambang, Cambodia; Empalme, Mexico; Foshan, China; Iloilo, Philippines; Parma, Italy; Shimizu, Japan |
| 2 | Temecula | California | Daisen-Nakayama, Japan; Leidschendam-Voorburg, Netherlands |
| 1 | Temple City | California | Hawkesbury, Australia |
| 1 | Torrance | California | Kashiwa, Japan |
| 1 | Tracy | California | Memuro, Japan |
| 6 | Union City | California | Chiang Rai, Thailand; Chinchongun, South Korea; Jalandhar, India; Pasay City, Philippines; Santa Rosalia, Mexico; Troisk, Russia |
| 2 | Upland | California | Caborca, Mexico; Mildura, Australia |
| 6 | Vallejo | California | Akashi, Japan; Bagamoyo, Tanzania; Baguio, Philippines; Chinchongun, South Korea; La Spezia, Italy; Trondheim, Norway |
| 2 | Walnut | California | Calamba City, Philippines; Shilin, Taiwan |
| 2 | Walnut Creek | California | Noceto, Italy; Siófok, Hungary |
| 1 | Waterford | California | Corn Island, Nicaragua |
| 1 | Whittier | California | Changshu, China |
| 1 | Woodland | California | La Piedad, Mexico |
| 1 | Yolo County | California | Šiauliai County, Lithuania |
| 1 | Yuba City | California | Fujishiro, Japan |
| 3 | Arvada | Colorado | Jinzhou, China; Kyzylorda, Kazakhstan; Mechelen, Belgium |
| 6 | Aspen | Colorado | Chamonix, France; Davos, Switzerland; Garmisch-Partenkirchen, Germany; Queenstown, New Zealand; San Carlos de Bariloche, Argentina; Shimukappu, Japan |
| 3 | Aurora | Colorado | Jacó, Costa Rica; Seongnam, South Korea; Zielona Góra, Poland |
| 6 | Boulder | Colorado | Dushanbe, Tajikistan; Jalapa, Nicaragua; Lhasa, China; Ciudad Mante, Mexico; Yamagata, Japan; Yateras, Cuba |
| 1 | Brighton | Colorado | Ziębice, Poland |
| 2 | Broomfield | Colorado | Broomfield, United Kingdom; Ueda, Japan |
| 1 | Canon City | Colorado | Kahoku, Japan |
| 7 | Colorado Springs | Colorado | Bankstown, Australia; Bishkek, Kyrgyzstan; Fujiyoshida, Japan; Kaohsiung, Taiwan; Nuevo Casas Grandes, Mexico; Olympia, Greece; Smolensk, Russia |
| 10 | Denver | Colorado | Brest, France; Takayama, Japan; Nairobi, Kenya; Karmiel, Israel; Potenza, Italy; Cuernavaca, Mexico; Chennai, India; Kunming, China; Axum, Ethiopia; Ulaanbaatar, Mongolia |
| 1 | Estes Park | Colorado | Monteverde, Costa Rica |
| 1 | Evans | Colorado | Ashby-de-la-Zouch, United Kingdom |
| 1 | Fort Collins | Colorado | Alcalá de Henares, Spain |
| 1 | Grand Junction | Colorado | El Espino, El Salvador |
| 1 | Greeley | Colorado | Moriya, Japan |
| 4 | Lakewood | Colorado | Chester, United Kingdom; Portsmouth, United Kingdom; Stade, Germany; Sutherland Shire, Australia |
| 1 | Littleton | Colorado | Bega, Australia |
| 2 | Longmont | Colorado | Chino, Japan; Ciudad Guzmán, Mexico |
| 6 | Pueblo | Colorado | Bergamo, Italy; Chihuahua, Mexico; Lucca Sicula, Italy; Maribor, Slovenia; Puebla, Mexico; Weifang, China |
| 2 | Steamboat Springs | Colorado | Saas-Fee, Switzerland; San Martín de los Andes, Argentina |
| 1 | Vail | Colorado | St. Moritz, Switzerland |
| 1 | Branford | Connecticut | Brentford, England |
| 1 | Bristol | Connecticut | Kozani, Greece |
| 1 | Canterbury | Connecticut | Hanko, Finland |
| 1 | Coventry | Connecticut | Coventry, England |
| 1 | Danbury | Connecticut | Decollatura, Italy |
| 2 | Enfield | Connecticut | Zhongli District, Taiwan; Ronneby, Sweden |
| 1 | Essex | Connecticut | Deschapelles, Haiti |
| 1 | Fairfield | Connecticut | Tatabánya, Hungary |
| 1 | Glastonbury | Connecticut | Glastonbury, England |
| 3 | Greenwich | Connecticut | Kitzbühel, Austria; Nacka Municipality, Sweden; Vienne, France |
| 2 | Haddam | Connecticut | Little Hadham, England; Much Hadham, England |
| 15 | Hartford | Connecticut | Bydgoszcz, Kuyavian-Pomeranian Voivodeship, Poland; Caguas, Puerto Rico; Cape Coast, Central Region, Ghana; Couva, Trinidad and Tobago; Dongguan, Guangdong Province, China; Floridia, Sicily, Italy; Freetown, Western Area, Sierra Leone; Hertford, Hertfordshire, England; João Pessoa, Paraíba, Brazil; Mangualde, Viseu, Portugal; Mao, Valverde, Dominican Republic; Morant Bay, Saint Thomas, Jamaica; New Ross, County Wexford, Ireland; Ocotal, Nueva Segovia, Nicaragua; Thessaloniki, Thessaloniki Province, Greece |
| 2 | Middletown | Connecticut | Cayey, Puerto Rico; Melilli, Italy |
