More than 720 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 |
|---|---|
| Oakland University | yes |
| Observatório Nacional | |
| Oklahoma State University - Center for Health Sciences | yes |
| Oklahoma State University - Oklahoma City | yes |
| Oklahoma State University - Stillwater | yes |
| Oklahoma State University - Tulsa | yes |
| Oklahoma State University Institute of Technology | yes |
| Old Dominion University | yes |
| Open University | |
| Open University of Cyprus | |
| Open University of Israel | |
| Oregon Health and Science University | yes |