Industrial Classification By SSIC (2020) Section H : POSTAL AND COURIER ACTIVITIES 53 : POSTAL AND COURIER ACTIVITIES 53 : POSTAL AND COURIER ACTIVITIES 531 : POSTAL ACTIVITIES 5310 : National Post Activities 53100 : National post activities (e.g. postal services) 532 : COURIER ACTIVITIES 5320 : Courier Activities Other than National Post Activities 53200 : Courier activities other than national post activities