In addition to the dealers, FINLANDIA 2017 welcomes the Postal Administrations from the participating countries to join.

The following Postal Administrations have confirmed their participation: 

Also, the following postal administrations are announced to be represented:

- Posten Norge (Åland post)

- Magyar Posta (Peterstamps)

- Royal Mail (Postimerkkiliike Lauri Peltonen Oy)