'It will be an action-orientated organisation which develops policy and promotes local government within the whole of Welsh society,' said Council of Welsh Districts assistant secretary Paul Griffiths.
Ad hoc groups could be set up to lobby political parties on the intended role of local government in housing, health care, education and training and economic development, with a view to influencing party manifestos.
A steering group met this week to agree the aims, structure and constitution of the association. A draft constitution will be prepared for the first meeting of the 64-member council at the end of February. The same meeting is expected to make an appointment to the £70,000-a-year post of association secretary.
'We are concerned about being dominated by the south,' said Denbighshire CC chairman Rhys Webb. 'We've put forward a proposal that all north Wales issues should be dealt with by north Wales and north Wales only.'