The Marton Carnegie Library was the last library building to be funded by the Carnegie Corporation in New Zealand.
Head Librarian Melanie Bovey said it was one of two Carnegie library buildings that are still operating as libraries.
"The other one is in Balclutha, my old home town."
The history of the Marton Library goes back to the 1900s when the library was described by a local newspaper as the "little box" housed in a small room at the Borough Council.
In 1913, the borough council was told in no uncertain terms by the chamber of commerce to solve the problem, Mrs Bovey said.