The Barking branch will close in August (Credit: Google Maps)
It is part of wider plans to shut 111 branches across the country by the end of August.
The bank said it is closing them due to an ongoing shift by customers towards mobile and online banking, a trend which has been accelerated by the pandemic.
Branch transactions reportedly fell by 33 per cent over the two years before the pandemic and declined by a further 50 per cent in 2020.
Most of the branches which are closing are within three miles of another branch, with the furthest being five miles away. They are also within half a mile of at least two free-to-use ATMs.
“We will provide every support to customers of closing branches to find alternative ways to bank with us that best suit their individual needs,” said Adam Bishop, head of branches.
“We are also working alongside our unions to support colleagues through these changes and to find alternative roles for those impacted wherever possible.
“We continue to believe that branches have an important role to play and we expect the size of our network to remain stable for the foreseeable future.”
Santander said it will carry out a programme of activities to help the customers of closing branches find alternative branches and access digital, telephone, and Post Office banking services.
It is also going to proactively contact vulnerable customers by phone to provide individual support if they are affected by the changes.
The Dagenham branch is set to close on Thursday, 15 July while the Harold Hill one will shut a week later on Thursday, 22 July.
Less than a month later, the Barking branch will close on Thursday, 12 August.
Around 452 branches will remain open across the UK.
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