- Ardingly Historical Society
- Battle & District Historical Society
- Beeding and Bramber Local History Society
- Billingshurst Local History Society
- Bognor Regis Local History Society
- Bognor Regis Natural Science Society
- Boxgrove History Group
- Burgess Hill Local History Society
- Chichester Local History Society
- Eastbourne Local History Society
- Eastbourne Heritage Centre
- Eastbourne Natural History and Archaeology Society
- The Eastbourne Society
- East Dean & Friston Local History Group
- Felpham and Middleton Local History Workshop
- The Fernhurst Society
- Hailsham Historical and Natural History Society
- Hastings Local History Group
- Heyshott History Society
- Ifold and District Local History Society
- Friends of Lewes
- Littlehampton Historical Society
- Ninfield Local History Group
- Peacehaven and Telscombe Historical Society
- Pevensey & Westham Historical Society
- Ringmer History Study Group
- Seaford Monumental Inscriptions Group
- The Shoreham Society
- Southern History Society
- Southwick Society
- Uckfield & District Preservation Society
- Wadhurst History Society
- Warnham Historical Society
- Warbleton and District History Group
- Westbourne Local History Group
- West Grinstead Local History Group
- Wivelsfield History Study Group
