- Corrigan Mental Health Center
- Corry Memorial Hospital
- Corterra of Wichita
- Coryell Memorial Hospital
- Coshocton Regional Medical Center
- Coteau des Prairies Health Care System Hospital
- Cottage Childrens Medical Center
- Cottage Hospital
- Cottage Rehabilitation Hospital
- Cottonwood Creek Behavioral Hospital
- Cottonwood Springs
- Cottonwood Tucson
- Coulee Medical Center
- Council Oak Comprehensive Health Care
- County of San Luis Obispo Health Agency
- Covenant Childrens Hospital
- Covenant Health Hobbs Hospital
- Covenant Hospital Levelland
- Covenant Hospital Plainview
- Covenant Medical Center
- Covenant Medical Center - Cooper
- Covenant Medical Center - Harrison
- Covenant Specialty Hospital
- Covington Behavioral Health
- Covington County Hospital
- Covington Trace ER & Hospital
- Cox Barton County Hospital
- Cox Medical Center Branson
- Cox Medical Center South
- Cox Monett Hospital