| The Arc of Robeson County NC, Inc | |
| The Arc of Sabine | Non-profit organization serving individuals with intellectual and developmental disabilities. |
| The Arc of Salem County | Serves and supports individuals with intellectual and developmental disabilities. |
| The Arc of San Juan County, Inc. | Improve the quality of life for individuals with intellectual and developmental disabilities of all ages by advocating for equal opportunities and choices in where and how they learn, live, work, play and socialize. |
| The Arc of Schuylkill County | Promotes and protects the human rights of people with intellectual and developmental disabilities and actively supports their full inclusion and participation in the community throughout their lifetimes. |
| The Arc of Scott County | Promotes and protects the human rights of people with intellectual and developmental disabilities and actively supports their full inclusion and participation in the community throughout their lifetimes. |
| The Arc of Sedgwick County, Inc. | Improve the quality of life for individuals with intellectual and developmental disabilities and their families, providing educational and social opportunities to enhance development of individual potential while advocating for supports and services in the community. |
| The Arc of Seward | |
| The Arc of Smyth County | |
| The Arc of Snohomish WA | Advocating for and serving people with intellectual and developmental disabilities and their families. |