- Lubelskie Voivodeship (Republic of Poland)
- Mazowieckie Voivodeship (Republic of Poland)
- Podkarpackie Voivodeship (Republic of Poland)
- Podlaskie Voivodeship (Republic of Poland)
- Świętokrzyskie Voivodeship (Republic of Poland)
- Alytus Region Development Council (Republic of Lithuania)
- Marijampole Region Development Council (Republic of Lithuania)
- Panevėžys Regional Development Council (Republic of Lithuania)
- Calarasi County (Romania)
- Caraș-Severin County (Romania)
- Dolj County (Romania)
- Maramureș County (Romania)
- Timiș County (Romania)
- Prešov Self-Governing Region (the Slovak Republic)
- Hajdú-Bihar County (Hungary)