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 |
|---|---|
| Abdus Salam International Centre for Theoretical Physics, Trieste | yes |
| Academy of Athens | yes |
| Adelphi University | yes |
| Agricultural University of Athens | yes |
| Alliant International University | yes |
| American University of Beirut | yes |
| Amherst College | yes |
| Aquaculture Centre of Acheloos S. A. (ICHTHICA) | yes |
| Aristotle University of Thessaloniki | yes |
| Arizona State University, College of Law | yes |
| Arizona State University, Polytechnic | yes |
| Arizona State University, Tempe | yes |
| Arizona State University, West | yes |
| Arkansas State University, Jonesboro | yes |
| Art Institute of Boston at Lesley University | yes |
| Athabasca University | |
| Athena Research Center in Information, Communication, and Knowledge Technologies | yes |
| Athens School of Fine Arts | yes |
| Athens University of Economics and Business | yes |
| Atlanta University Center | yes |