- Camp Fire USA Illinois Prairie Council
- Candor Health Education
- Canticle Ministries
- Care and Counseling Center
- Care For Cars
- Career & Networking Center
- CareLink Foundation
- Caring Network
- CASA of DuPage County, Inc.
- Catholic Charities, Diocese of Joliet
- Center for Advancing Domestic Peace
- Center for Speech and Language Disorders
- Central Baptist Children's Home
- Central DuPage Pastoral Counseling Center
- Century Walk Corporation
- Chicago Dental Society Foundation
- Chicago Sinfonietta
- Child Friendly Courts Foundation
- Child's Voice
- Churchville Middle School/Elmhurst District 205
- Citizen Advocacy Center
- City of Warrenville
- Clarendon Hills Park District
- ClaySpace
- College of DuPage Foundation
- Community Adult Day Center
- Community Art Partners
- The Community House
- Community Housing Advocacy and Development
- Compudopt
- The Conservation Foundation
- Conservation Research Institute
- Cosley Zoo/ Cosley Foundation
- Covenant Living at Windsor Park
- Creating IT Futures Foundation, Inc.
- CREO DuPage
- Crisis Line of DuPage
