The brief, worth over £200,000 annually, will run for three years. An initial awareness campaign for council staff will be followed by an external campaign aimed at residents. The move comes after some local authorities and NGOs have voiced concern about residents missing out on entitlements.
Separately, St Helens Council is also encouraging benefit take-up, specifically for over-60s, via a series of road shows.
The Merseyside authority has circulated posters in doctors' surgeries and other public areas inviting the target audience to the events. In April, Age Concern said up to two million pensioners were failing to claim an entitlement.
The charity said claiming extra benefits could help some pensioners cut their bills by more than £500 a year.
It said more than £1.1bn goes unclaimed in benefits for older people each year.