P / Q's[]
- {{Flag|us-pa}}
- {{Flag|Pennsylvania}} (US)
- {{Flag|pn}}
- {{Flag|Pitcairn, Henderson, Ducie and Oeno Islands}}
- {{Flag|Pitcairn Islands}} (UK)
- {{Flag|Um-95}}
- {{Flag|Us-Um-95}}
- {{Flag|Palmyra Atoll}} (US)
- {{Flag|Um-95-2}}
- {{Flag|Us-Um-95-2}}
- {{Flag|Palmyra Atoll2}} (US)
- {{Flag|pr}}
- {{Flag|us-pr}}
- {{Flag|Commonwealth of Puerto Rico}}
- {{Flag|Puerto Rico}} (US)
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R's[]
- {{Flag|Ae-Rk}}
- {{Flag|Ras al-Khaimah}} (AE)
- {{Flag|us-ri}}
- {{Flag|Rhode Island}} (US)
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S's[]
- {{Flag|us-sc}}
- {{Flag|South Carolina}} (US)
- {{Flag|us-sd}}
- {{Flag|South Dakota}} (US)
- {{Flag|Su}}
- {{Flag|USSR}}
- {{Flag|Soviet Union}}
- {{Flag|Union of Soviet Socialist Republics}}
- Disbanded WP on December 26, 1991
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