GP's link includes:

  * Brooklyn Public Library
  * Monroe County Library System
  * Queens Public Library
  * Charlotte Mecklenburg Library
  * Chapel Hill Public Library
  * Houston Public Library
  * Fairfax County Public Library

Here are some more [0, 1]:

  * Free Library of Philadelphia
  * Los Angeles Public Library
  * Atlanta-Fulton Library
  * Austin Public Library
  * Enoch Pratt Free Library
  * New Orleans Public Library
  * Orange County Library System
  * Westchester Library System
  * Carnegie Library of Pittsburgh

[0] https://blog.the-ebook-reader.com/2011/09/22/library-ebooks-...

[1] https://wiki.mobileread.com/wiki/EBook_Lending_Libraries#Wid...