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 as such in the lists below.
| Libraries | Archive Founders |
|---|---|
| National Agricultural Research Foundation | yes |
| National and Kapodistrian University of Athens | yes |
| National Centre for Biological Sciences, Bangalore, India | yes |
| National Centre for Scientific Research Demokritos | yes |
| National Centre for Social Research (EKKE) | yes |
| National Hellenic Research Foundation - National Documentation Centre | yes |
| National Institutes of Health | yes |
| National Library of Greece | yes |
| National Observatory of Athens | yes |
| National Technical University of Athens | yes |
| National University of Ireland, Galway | yes |
| National University of Ireland, Maynooth | yes |
| National-Louis University | yes |
| New York Public Library | yes |
| New York State Library | yes |
| New York University | yes |
| Newman University | yes |
| North Carolina State University | yes |
| Northern Illinois University | |
| Northern Kentucky University | yes |