Just under 1,000 children are currently members of the Letterbox Club for 2008 across 52 local authorities.

We hope there will be even more members in 2009 when the Letterbox Club will be open to every local authority in the United Kingdom, on a subscription basis for each child enrolled.

In 2008 we were joined by 30 additional local authorities, covering every government region in England:

Essex
Bedfordshire
Luton 
Durham
Hartlepool
Kirklees
Leeds
N Tyneside
Newcastle
NE Lincs
Nottingham City
Sheffield
Bury
Halton
Knowsley
Tameside
Wirral
Cumbria
Wokingham
Slough
Warwickshire
Cornwall
Dorset
Staffordshire
Somerset
Brent
Hammersmith & Fulham
Ealing
Merton
Sutton
Suffolk
Gateshead
Leicester City
Leicestershire
Northamptonshire
Brighton & Hove
Portsmouth
Southampton
Manchester
Milton Keynes
Oxfordshire
Dudley
Solihull
Stoke-On-Trent
Wolverhampton
Worcestershire
North Somerset
Bath & NE Somerset
Bournemouth
Bristol
Gloucestershire
Kensington & Chelsea

In 2007, 22 local authorities in England, and NCH in Wales, took part in the Letterbox Club:

Suffolk
Gateshead
Leicester City
Leicestershire
Northamptonshire
Brighton & Hove
Portsmouth
Southampton
Manchester
Milton Keynes
Oxfordshire
Dudley
Solihull
Stoke-On-Trent
Wolverhampton
Worcestershire
North Somerset
Bath & NE Somerset
Bournemouth
Bristol
Gloucestershire
Kensington & Chelsea
NCH Wales

During 2003-2006 developmental pilot work took place in:

Leicester City & Suffolk