| Name | Role | Place | Source | |
|---|---|---|---|---|
| Pier R Poortinga | Registered | 1859 | Birdaard | Population register |
| Pier R Poortinga | Registered | 1859 | Birdaard | Population register |
| R J Poortinga | Registered | Achtkarspelen | Population register | |
| R. Poortinga | Travelers | 1949 | Rotterdam | Passenger registers |
| R. Poortinga | Registered | 's-Gravenhage | Individual Files | |
| R. Poortinga | Marinier | 's-Gravenhage | Individual Files |
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