Bloomington

• Posoltega, Nicaragua

• Santa Clara, Cuba

Carmel

• Cortona, Italy

• Jelgava, Latvia

• Kawachinagano, Japan

• Rueil-Malmaison, France

• Seiffen, Germany 

• Visakhapatnam, India

Elkhart

• Apan, Mexico

• Burton upon Trunt, England

• Jinhua, China

• Kurdjali, Bulgaria

• Tongxiang, China

Fort Wayne

• Gera, Germany

• Mawlamyine, Myanmar

• Plock, Poland

• Taizhou, China

• Takaoka, Japan

Greenfield

• Kakuda, Japan

Jasper

• Pfaffenweiler, Germany

Noblesville

• Cittadella, Italy

• Nova Prata, Brazil

Vincennes

• Ovruch, Ukraine

• Vincennes, France

• Wasserburg, Germany

• Xuyi County, China

Wabash

• Korosten, Ukraine

Anderson

• Bernburg, Germany (Dormant)

• Yuhang, China

Batesville

• Haiyan County, China

Bedford

• Fenghua, China

Columbus

• Loehne, Germany

• Pune, India

• Miyoshi, Japan

• Xiangyang, China

Decatur

• Jiaojiang, China (Dormant)

Evansville

• Osnabrück. Germany

• Tizimín, Mexico

• Tochigi, Japan

Fishers

• Billericay, United Kingdom

• Binjiang, China

Frankfort

• Lanxi, China

Franklin

• Kuji, Japan

Gary

• Fuxin, China

Goshen

• Bexbach, Germany

Greencastle

• Shaoxing, China

Hammond

• Galati, Romania

• Shahe, China

Indianapolis

• Campinas, Brazil

• Cologne, Germany

• Hangzhou, China

• Hyderabad, India

• Le Mans, France

• Monza, Italy

• Northamptonshire, United Kingdom

• Onitsha, Nigeria

• Piran, Slovenia

• Queretaro, Mexico

• Taipei, Taiwan

Kokomo

• Dongyang, China

La Porte

• Grangemouth, United Kingdom

Lafayette

• Longkou, China

• Ota, Japan

Marion

• Jindong, China (Dormant)

Mishawaka

• Shiojiri, Japan

Monticello

• Liubar, Ukraine

• Zhejiang's Deqing, China

Muncie

• Changhua, Taiwan

• Deyang, China

• Isparta, Turkey

• Taraz, Kazakhstan

• Zhuji, China

Newburgh

• Newburgh, England

Princeton

• Tahara, Japan

Richmond

• Serpukhov, Russia (Dormant)

• Unnan, Japan

• Zweibrucken, Germany (Dormant)

Shelbyville

• Shizuoka, Japan

South Bend

• Arzberg, Germany

• Czestochowa, Poland

• Guanajuato, Mexico

Speedway

• Motegi, Japan

Terra Haute

• Tajimi, Japan

• Tambov, Russia

Valparaiso

• Huzhou, China

• Nanhu, China