| Province of Treviso | 0 | Italy | IT-TV |
| Province of Trieste | 0 | Italy | IT-TS |
| Province of Udine | 0 | Italy | IT-UD |
| Province of Varese | 0 | Italy | IT-VA |
| Province of Verbano-Cusio-Ossola | 0 | Italy | IT-VB |
| Province of Vercelli | 0 | Italy | IT-VC |
| Province of Verona | 0 | Italy | IT-VR |
| Province of Vibo Valentia | 0 | Italy | IT-VV |
| Province of Vicenza | 0 | Italy | IT-VI |
| Province of Viterbo | 0 | Italy | IT-VT |
| PS | 0 | Hungary | HU-PS |
| PSK | 0 | Russia | RU-PSK |
| PTE | 0 | United Kingdom | GB-PTE |
| Ptuj City Municipality | 0 | Slovenia | SI-096 |
| Puconci Municipality | 0 | Slovenia | SI-097 |
| Pukë District | 0 | Albania | AL-PU |
| PV | 0 | Spain | ES-PV |
| PV | 0 | Slovakia | SK-PV |
| Qala | 0 | Malta | MT-42 |
| QC | 5 | Canada | CA-QC |
| QLD | 0 | Australia | AU-QLD |
| Qormi | 0 | Malta | MT-43 |
| Qrendi | 0 | Malta | MT-44 |
| Rabat | 0 | Malta | MT-46 |
| Rače–Fram Municipality | 0 | Slovenia | SI-098 |
| Radeče Municipality | 0 | Slovenia | SI-099 |
| Radenci Municipality | 0 | Slovenia | SI-100 |
| Radlje ob Dravi Municipality | 0 | Slovenia | SI-101 |
| Radoviš Municipality | 0 | Republic of North Macedonia | MK-64 |
| Radovljica Municipality | 0 | Slovenia | SI-102 |
| Radviliškis District Municipality | 0 | Lithuania | LT-37 |
| Rakovník | 0 | Czech Republic | CZ-20C |
| Rankovce Municipality | 0 | Republic of North Macedonia | MK-65 |
| Rapla County | 0 | Estonia | EE-70 |
| Raseiniai District Municipality | 0 | Lithuania | LT-38 |
| Rasina District | 0 | Serbia | RS-19 |
| Raška District | 0 | Serbia | RS-18 |
| Rauna Municipality | 0 | Latvia | LV-076 |
| Ravne na Koroškem Municipality | 0 | Slovenia | SI-103 |
| Razgrad Province | 0 | Bulgaria | BG-17 |
| Razkrižje Municipality | 0 | Slovenia | SI-176 |
| RCC | 0 | United Kingdom | GB-RCC |
| RCH | 0 | United Kingdom | GB-RCH |
| RCT | 0 | United Kingdom | GB-RCT |
| RD | 0 | Luxembourg | LU-RD |
| RDB | 0 | United Kingdom | GB-RDB |
| RDG | 0 | United Kingdom | GB-RDG |
| RE | 0 | Moldova | MD-RE |
| Rečica ob Savinji Municipality | 0 | Slovenia | SI-209 |
| Region of Southern Denmark | 0 | Denmark | DK-83 |
| Region Zealand | 0 | Denmark | DK-85 |
| Renče–Vogrsko Municipality | 0 | Slovenia | SI-201 |
| Republika Srpska | 0 | Bosnia and Herzegovina | BA-SRP |
| Resen Municipality | 0 | Republic of North Macedonia | MK-66 |
| Réunion | 0 | France | FR-RE |
| Rēzekne | 0 | Latvia | LV-REZ |
| Rēzekne Municipality | 0 | Latvia | LV-077 |
| RFW | 0 | United Kingdom | GB-RFW |
| Rhône-Alpes | 0 | France | FR-V |
| RI | 0 | Moldova | MD-RI |
| RI | 7 | United States | US-RI |
| RI | 0 | Spain | ES-RI |
| Ribnica Municipality | 0 | Slovenia | SI-104 |
| Ribnica na Pohorju Municipality | 0 | Slovenia | SI-177 |
| RIC | 0 | United Kingdom | GB-RIC |
| Riebiņi Municipality | 0 | Latvia | LV-078 |
| Rietavas municipality | 0 | Lithuania | LT-39 |
| Riga | 0 | Latvia | LV-RIX |
| Rivne Oblast | 0 | Ukraine | UA-56 |
| RM | 0 | Luxembourg | LU-RM |
| RN | 0 | Ireland | IE-RN |
| Rogaland | 0 | Norway | NO-11 |
| Rogaška Slatina Municipality | 0 | Slovenia | SI-106 |
| Rogašovci Municipality | 0 | Slovenia | SI-105 |
| Rogatec Municipality | 0 | Slovenia | SI-107 |
| Roja Municipality | 0 | Latvia | LV-079 |
| Rokiškis District Municipality | 0 | Lithuania | LT-40 |
| Rokycany | 0 | Czech Republic | CZ-326 |
| Ropaži Municipality | 0 | Latvia | LV-080 |
| ROS | 0 | Russia | RU-ROS |
| Rosoman Municipality | 0 | Republic of North Macedonia | MK-67 |
| ROT | 0 | United Kingdom | GB-ROT |
| Rožaje Municipality | 0 | Montenegro | ME-17 |
| RP | 0 | Germany | DE-RP |
| Rucava Municipality | 0 | Latvia | LV-081 |
| Rugāji Municipality | 0 | Latvia | LV-082 |
| Ruggell | 0 | Liechtenstein | LI-06 |
| Rūjiena Municipality | 0 | Latvia | LV-084 |
| Rundāle Municipality | 0 | Latvia | LV-083 |
| Ruše Municipality | 0 | Slovenia | SI-108 |
| Ruse Province | 0 | Bulgaria | BG-18 |
| RUT | 0 | United Kingdom | GB-RUT |
| RYA | 0 | Russia | RU-RYA |
| Rychnov nad Kněžnou | 0 | Czech Republic | CZ-524 |
| SA | 0 | Australia | AU-SA |
| SA | 0 | Spain | ES-SA |
| SA | 0 | Russia | RU-SA |
| Saare County | 0 | Estonia | EE-74 |
| Saint Barthélemy | 0 | France | FR-BL |
| Saint Lawrence | 0 | Malta | MT-50 |
