| Member | Population | Operational |
|---|
| Hull & East Yorkshire Early Intervention Service | 500,000 | Yes |
| Gloucester Early Intervention Service | 500,000 | Yes |
| Derbyshire Early Intervention Service | 1 million | Yes |
| Worcester Early Intervention Service | 500,000 | Yes |
| Selby and York Early Intervention Service | 1.2 million | Yes |
| Northamptonshire Early Intervention Service | 1.2 million | Yes |
| Rotherham Early Intervention Service | 500,000 | Yes |
| North Staffordshire Early Intervention Service | 500,000 | Yes |
| Sheffield Early Intervention Service | 500,000 | Yes |
| Barnsley Early Intervention Service | 270,000 | Yes |
| Craven, Harrogate & Rural District Service | 150,000 | Yes |
| Sandwell Early Intervention Service | Unknown | Yes |
| County Durham & Darlington Priority Service | Unknown | Yes |
| West Sussex Early Intervention Service | Unknown | Yes |
| Walsall Early Intervention Service | Unknown | Yes |
| South Essex Early Intervention Service | Unknown | Yes |
| North Cumbria Early Intervention Service | Unknown | Yes |
| North Lincolnshire Early Intervention Service | Unknown | Yes |
| North East Lincolnshire Early Intervention Service | Unknown | Yes |
| Leeds Early Intervention Service | Unknown | Yes |
| Leicestershire Early Intervention Service | Unknown | Yes |
| Mersey Care Early Intervention Service | Unknown | Yes |
| Bradford Early Intervention Service | Unknown | Yes |
| Devon Early Intervention Service | Unknown | Yes |