- 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 Regional 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)
- Hunedoara County Council (Romania)
- Regional Development Agency “Centru” (Romania)
- Prešov Self-Governing Region (the Slovak Republic)
- Hajdú-Bihar County (Hungary)
- Dobrich District (Bulgaria)
- Lviv Oblast (Ukraine)
- Tarnopil Oblast (Ukraine)
- Odesa Oblast (Ukraine)
- Rivne Oblast (Ukraine)
- Khmelnytskyi Oblast (Ukraine)
- Zakarpattia Oblast (Ukraine)
- Luhansk Oblast (Ukraine)
- Volyn Oblast (Ukraine)
- Zhytomyr Oblast (Ukraine)
- Ștefan Vodă District (Moldova)