The organisations that make up the Mid and South Essex Integrated Care System are:
- Mid and South Essex Integrated Care Board
- Three upper tier local authorities:
- Essex County Council
- Southend-on-Sea City Council (unitary)
- Thurrock Council (unitary)
- Seven district councils:
- One acute hospital provider:
- Mid and South Essex Community Collaborative, bringing together NHS community services in mid and south Essex:
- One ambulance service provider:
- Primary care:
- Three local independent watchdog bodies:
- Nine community voluntary services
- Basildon, Billericay and Wickford CVS
- Brentwood CVS
- Castle Point Association of Voluntary Services (CAVS)
- Chelmsford CVS
- Community 360 (covering the Braintree District)
- Other partners include:
- Essex Police
- Essex County Fire and Rescue Service
- parish and town councils
- local medical committee
- local university and colleges
- community and faith organisations