Campaigners say the temporary replacement for Barham Park Library is “going from strength to strength”.
Barham Park Library, which was open for 60 years in Harrow Road, was one of six closed by Brent Council last year.
Friends of Barham Park campaign group decided to set up the pop-up library in Barham Primary School, in Danethorpe Road, two weeks ago.
The library opens every Saturday and will run until the end of July.
Campaigner Francis Henry, who lives in Compton Avenue, volunteers every week along with his seven-year-old daughter, Gabriella.
He said: “The benefits of a library for young people are especially obvious. We have had around 50 members sign up and they keep coming back. Everyone in the community loves it.
“We do lots of games and competitions and try to make it as interactive as possible. Surely this shows the importance of needing a library in the area?”
The group is also hopeful that Brent Council will allow them to run a library in the former premises in Barham Park, which is currently empty, but this has so far been refused.
Mr Henry says he was disappointed with this decision.
The 47-year-old added: “The benefits of a library for young people are obvious. It’s a shame that the council prefers to keep the old Barham Library empty rather than allowing local people the opportunity to provide a much needed service to people in the area.”
The library features books for people of all ages, from adult fiction to children’s classics, but it is looking to expand.
Other libraries affected by the decision to close the libraries were in Preston, Tokyngton, Cricklewood, Kensal Rise and Neasden.
It sparked a year-long legal battle by Brent Save Our Six libraries (SOS), but last October the High Court ruled they could not be saved.
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