There are currently 44 participating P-member countries which include the following:
- Argentina (IRAM)
- Australia (SA)
- Austria (ASI)
- Belgium (NBN)
- Brazil (ABNT)
- Canada (SCC)
- Chile (INN)
- China (SAC)
- Denmark (DS)
- Finland (SFS)
- France (AFNOR)
- Germany (DIN)
- Iran, Islamic Republic of (ISIRI)
- Ireland (NSAI)
- Israel (SII)
- Italy (UNI)
- Jamaica (BSJ)
- Japan (JISC)
- Korea, Republic of (KATS)
- Luxembourg (ILNAS)
- Malaysia (DSM)
- Netherlands (NEN)
- New Zealand (SNZ)
- Norway (SN)
- Portugal (IPQ)
- Singapore (SPRING SG)
- South Africa (SABS)
- Spain (AENOR)
- Sweden (SIS)
- Switzerland (SNV)
- Turkey (TSE)
- United Kingdom (BSI)
- United States (ANSI)