The group has added stores and households to the network several times since its launch in 2020.
The robots are made by Starship Technologies and orders can be made through an app.
The latest announcement means local communities in Blackthorn, Far Cotton, Grange Park, Southfields and Thornton Park will now see Starship’s robots, which look like cold boxes on wheels, on the streets.
Chris Conway, Co-op’s head of e-commerce, said: “Co-op is committed to exploring new and innovative ways to increase access to our products and services.
“Our members and our customers lead busy lives and ease, speed and convenience is at the heart of our approach.
“Co-op stores are well placed, close to our customers, to serve shoppers locally.
“Orders are picked locally, in-store, and a key part of our strategy is to use our physical footprint to also offer same-day, rapid, home deliveries.”
Andrew Curtis, UK operations manager at Starship Technologies, said: “Local residents in Northampton have embraced the benefits of contactless delivery over the last 18-plus months and we are very happy to be able to offer our service to even more communities across the town from today.
“The environmental benefits of autonomous delivery are clear, and it has also been very encouraging to see how much the robots have been welcomed and integrated as part of the local community in Northampton.”
Northampton residents can choose from a range of more than 2,000 grocery items, schedule their delivery, then drop a pin where they want their delivery to be sent.
They can watch in real time via an interactive map as the robot makes its journey to them.
Once the robot arrives, they receive an alert, and can meet and unlock it through the app.
The robots use a combination of sensors, artificial intelligence and machine learning to travel on pavements and navigate around any obstacles, while computer vision-based navigation helps them map their environment to the nearest inch.