Forum of Economic Chambers of Mazovia was established in 2005 and is made up of 9 Chambers of Commerce operating in Mazovia:
- Ciechanów
- Legionowo
- Ostrów Mazowiecka
- Płock
- Płońsk
- Radom
- Siedlce
- Sochaczew
- Warszawa
The Forum of Economic Chambers of Mazovia has influenced the agreement between Entrepreneurs associated in economic self-government organizations and the authorities at the local, regional and national level from the very beginning. The forum is a platform for cooperation for the active development of the voivodship.