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 |
|---|---|
| Illinois College | yes |
| Illinois Wesleyan University | yes |
| Imperial College London | yes |
| Indiana University - Purdue University, Fort Wayne | yes |
| Indiana University - Purdue University, Indianapolis | yes |
| Indiana University, Bloomington | yes |
| Indiana University, Kokomo | yes |
| Indiana University, Ruth Lilly Medical Library | yes |
| Indiana University, South Bend | yes |
| Instituto Agronômico de Campinas | |
| Instituto de Botânica | |
| Instituto de Pesquisas Jardim Botânico do Rio de Janeiro | |
| Instituto de Prev. Dos Servidores do Estado de Minas Gerais | |
| Instituto de Radioproteção e Dosimetria | |
| Instituto Militar de Engenharia | |
| Instituto Municipal de Ensino Superior de São Caetano do Sul | |
| Instituto Nacional de Câncer | |
| Instituto Nacional de Matematica Pura e Aplicada | |
| Instituto Nacional de Pesquisas da Amazonia | |
| Instituto Nacional de Pesquisas Espaciais |