Citizens Advice said the extra delivery centres will be based at Southwark, Brent and Waltham Forest in London, plus Chelmsford, Wigan and Kirklees.
In January Citizens Advice named the first 44 delivery centres and the latest bring the total to 50.
Overall, there will be 500 places from which the service will operate across England and Wales, with each centre having 'outreach' locations or sub-centres.
The delivery centres have been selected to offer a geographical spread using data on the local population approaching retirement age, according to Gillian Guy, chief executive of Citizens Advice.
She said: "Pension Wise is the starting point in helping people to take control of their finances for retirement. Face to face guidance will enable people to understand their pension options and how they relate to their own situation, so they can make informed choices.

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"The size of the Citizens Advice network means that we can be flexible and respond to demand by providing support in the nearest available locations, giving easy access to Pension Wise."
Each delivery centre will employ between three and eight paid, fully trained members of Pension Wise guidance staff.
Staff numbers across the delivery centres and the outreach locations will vary depending on the size of the areas covered and the size of the local population who would benefit from guidance.
People will be able to go into any Citizens Advice Bureau to find out about Pension Wise, check if they would benefit from a guidance session and be helped to get an appointment.
Pension Wise guidance will also be delivered by a telephone service operated by The Pension Advisory Service and online via the Government's Pension Wise website.

The 50 Citizens Advice Pension Wise delivery centres are:

East Midlands
Derbyshire Districts
Lincoln and District
Leicestershire
East of England
Peterborough
Central and East
Northamptonshire
Stevenage
Diss, Thetford and District
London
Brent
Merton and Lambeth
East End
Sutton Borough
Waltham Forest
Southwark
North East
North Tyneside
Darlington
North West
Cheshire West
Manchester
North Liverpool
Allerdale
Lancashire West
Wigan
South East
Rushmoor
West Oxon
Hastings and Rother
High Wycombe
Arun and Chichester
Bournemouth
Maidstone
Chelmsford
South West
Plymouth
Taunton
Cornwall
Wiltshire
West Midlands
Staffordshire Southwest
Wolverhampton
Shropshire
Coventry
Worcester and WHABAC
Yorkshire and Humber
Hull and East Riding
Sheffield
Leeds
Hambelton and Richmondshire
Kirklees
Wales
Powys
Cardiff and Vale
Caerphilly
Denbighshire
Ynys Mon
Pembrokeshire
Ceredigion