Collective members of NSS are the following institutions:
- Gemer-Malohont Museum, Rimavská Sobota – https://gmmuzeum.sk/
- Museum of Ján Thain, Nové Zámky – http://www.muzeumnz.sk/
- Museum of Coins and Medals in Kremnica, Kremnica – https://www.muzeumkremnica.sk/
- Novohrad Museum and Gallery, Lučenec – https://nmg.sk/o-nmg/kontakty/
- National History Museum in Galanta, Galanta – https://www.muzeumgalanta.sk/
- West Slovak Museum, Trnava – http://www.zsmuzeum.sk/
- Záhorie Museum in Skalica, Skalica – https://www.zahorskemuzeum.sk/