The Post Office confirmed that it is offloading 108 crown branches, which are those currently directly owned and run by the company, including 36 in London.
The process could see the sites taken over by other businesses, while others could face closure as franchises are moved to different premises.
One of those at risk is Cricklewood post office, in Cricklewood Broadway, which campaigners are battling to keep open.
Richard Rowland, who lives in Cricklewood, set up a petition in November when news broke that the post office could close urging people to help “preserve our beloved community hub”.
His petition on change.org quickly received more than 588 signatures and now has 1,274 signatures.
The branch in Kilburn High Road, on the Camden and Brent border, is also on the list.
Others listed were in High Street, Barnet; Headstone Drive, Harrow; Kingsbury Road, Kingsbury; Upper Street, Islington; South Mall, Edmonton Green; and Stamford Hill, Hackney.
The Post Office said the plan, which is subject to Government funding, will help it to increase postmaster remuneration by an extra £250 million a year by 2030.
Post Office chairman Nigel Railton said: “Moving to a fully franchised network is one part of enabling the Post Office to deliver a New Deal for Postmasters, helping to create a long-term, sustainable future for the Post Office.
“By franchising these branches, we are protecting access to our services for communities right across the UK and realising £40 million worth of savings that will enable us to uplift postmasters’ remuneration by up to 10%.”
To sign the Cricklewood petition visit https://www.change.org/p/save-cricklewood-post-office