Newcastle is served by the King County Library System (KCLS). While no library currently exists in the City's limits, KCLS received voter approval to construct a library in the city. Presently, the library is in its planning stages.

The closest library to Newcastle is currently:

Newport Way Library
14250 S.E. Newport Way
Bellevue, Washington 98006
website: http://www.kcls.org/npw/home.cfm
phone: 425.747.2390

To go to the King County Library's page
website: www.kcls.org