They are pooling their resources to cover credit, lifestyle, behavioural, transactional and trigger information.
The two companies said they have been working together informally for a number of years and have decided to as more of their joint clients start to require a fresh approach to targeted marketing.
Alistair Blaxill, executive director at Communisis, said: "The partnership allows us to deliver unparalled levels of data granularity and expertise to our customers, across numerous vertical sectors."
Jim Broom, strategic client director at Equifax, said: "It isn't just about pooling disparate data - the collaboration will bring together a collective team of experts and complimentary skill sets that will keep both companies at the forefront of industry innovation."