The original trial was launched in September with five shops, but following increased demand, more locations and shops have now been added.
The new trial areas include Winchester, Hereford, Brighton, Glasgow and Solihull.
Waitrose has reportedly also added an additional 150 products, ranging from ready meals to health and beauty selections to the Deliveroo menu, taking the total number of available products on Deliveroo to more than 650.
James Bailey, executive director for Waitrose said: “This trial has made a very promising start in attracting customers to Waitrose through an entirely new channel – and is already contributing to significant sales growth in all of the branches where it is up and running.”
The partnership with Deliveroo has “underlined the ambitions” and new strategy set out by the John Lewis Partnership in July, which emphasised Waitrose’s intention to explore more commercial partnerships.
Ajay Lakhani, VP of new business at Deliveroo said: “We are delighted that Waitrose’s on-demand grocery trial with Deliveroo is proving so popular with customers and now covers 30 locations across the UK.
“At a worrying time for families across the country we are so pleased that even more customers across the country can now enjoy an extended range of Waitrose’s amazing food.”