The two firms have taken up larger spaces at Central House in the town.
IDHL, the parent digital group of both firms, is currently targeting £10.5m in revenues and £3m in net profit for 2016, with over 100 staff.
Alongside the new Harrogate base, IDHL also has offices in Wetherby and London.
Lisa Higham of IDHL said: “We have enjoyed huge growth over the last few years and we recently recruited ten new staff members to the marketing content team which meant we desperately needed more space. Central House provides us with the space and quality that we need in a central location which will enable us to continue our growth.”
The deal was brokered for the landlord’s investment managers CEG by national property consultant Carter Jonas.
Chris Hartnell, associate with Carter Jonas, said: “We are delighted to welcome IDHL to Central House as they add to the list of quality occupiers already in situ such as Vp plc, High Street TV and Bluefin.”