More than 650 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 by an icon in the lists below.
| Libraries | Archive Founders |
|---|---|
| Academy of Athens | yes |
| Agricultural University of Athens | yes |
| Aquaculture Centre of Acheloos S. A. (ICHTHICA) | yes |
| Aristotle University of Thessaloniki | yes |
| Athena Research Center in Information, Communication, and Knowledge Technologies | yes |
| Athens School of Fine Arts | yes |
| Athens University of Economics and Business | yes |
| Biomedical Sciences Research Center "Alexander Fleming" | yes |
| Centre for Renewable Energy Sources | yes |
| Centre for Research and Technology | yes |
| Democritus University of Thrace | yes |
| Foundation for Research and Technology, Hellas | yes |
| General Secretariat for Research and Technology | yes |
| Greek Atomic Energy Commission | yes |
| Harokopio University of Athens | yes |
| Hellenic Centre for Marine Research | yes |
| Hellenic Open University | yes |
| Hellenic Parliamentary Library | yes |
| Hellenic Pasteur Institute | yes |
| Ionian University | yes |