More than 740 libraries around the world have chosen to include participation in Portico as one important component of their digital preservation strategy. Early participants are designated Archive Founders and are identified as such in the lists below.
| Libraries | Archive Founders |
|---|---|
| Radiological Protection and Dosimetry Institute | |
| Reed College | yes |
| Rice University | yes |
| Rio Branco Institute | |
| Rio de Janeiro State University | |
| Robert Gordon University | |
| Rochester Institute of Technology | yes |
| Rockefeller University | yes |
| Roma Tre University | yes |
| Royal Conservatoire of Scotland | |
| Royal Holloway, University of London | |
| Royal Melbourne Institute of Technology, Melbourne | yes |
| Rutgers University, New Brunswick |