The UNEX™ program has a large number of participating postal operators.

Currently, there are 36 postal operators participating in the UNEX™ programme (below in alphabetical order based on the ISO Code).

 Postal Operator Country  Country Code
ISO alpha-2 
Österreichische Post AG  Austria  AT
Australia Post  Australia AU
bpost  Belgium BE
Bulgarian Posts plc  Bulgaria BG
Canada Post   Canada CA
Post CH  Switzerland CH
Cyprus Post  Cyprus CY
Česká Pošta  Czechia CZ
Deutsche Post DHL Group  Germany DE
PostNord Danmark  Denmark DK
Omniva  Estonia EE
Correos  Spain ES
Posti  Finland FI
Le Groupe La Poste  France FR 
Royal Mail Group plc  United Kingdom GB
Hellenic Post ELTA  Greece GR
Croatian Post  Croatia HR
Magyar Posta  Hungary HU
An Post  Ireland IE
Israel Postal Company Ltd.  Israel IL
Iceland Post  Iceland IS
Poste Italiane S.p.A.  Italy IT
Lietuvos Paštas  Lithuania LT
POST Luxembourg  Luxembourg LU
Latvijas Pasts  Latvia LV
MaltaPost   Malta MT
PostNL  The Netherlands NL
Posten Bring AS  Norway NO
NZ Post  New Zealand NZ
Poczta Polska  Poland PL
CTT Portugal Post  Portugal PT
Poşta Româna  Romania RO
PostNord Sverige  Sweden SE
Pošta Slovenije  Slovenia SI
Slovenská Pošta  Slovakia SK
United States Postal Service  USA US