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| 01. | Olesa | Pic | |
| 02. | Olias | 1937 - 1938 | Pic |
| 03. | Oliva | Pic | |
| 04. | Olleria | Pic | |
| 05. | Olo | Pic | |
| 06. | Olost de Llusanes | Pic | |
| 07. | Olot | Pic | |
| 08. | Onda | Pic | |
| 09. | Ondara | 1937 | Pic |
| 10. | Onil | Pic | |
| 11. | Onteniente | Pic | |
| 12. | Ontur | Pic | |
| 13. | Orcera | Pic | |
| 14. | Orense | 1936 - 1938 | Pic |
| 15. | Orense (Spain Republic stamps overprint) | 1936 - 1938 | Pic |
| 16. | Orgiva | 1937 | Pic |
| 17. | Orihuela | Pic | |
| 18. | Oropesa | Pic | |
| 19. | Osona | Pic | |
| 20. | Osuna | 1937 | Pic |
| 21. | Otivar | 1936 - 1938 | Pic |
| 22. | Oviedo | Pic |
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Last update: 2018.09.06
