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- Count of Óbidos
- Count of Odemira
- Count of Oeiras
- Count of Olivais
- Count of Oliveira dos Arcos
- Count of Olivença
- Count of Oriola
- Count of Ottolini
- Count of Ourém
Read more about this topic: List Of Countships In Portugal
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Read more about this topic: List Of Countships In Portugal