Location Information 33 Hawthorne Avenue Central Islip , NY 11722-2498 The library is closed at 5:00 p.m. on Fridays and all day on Sundays during the summer. Phone: (631) 234-9333Fax Number: (631) 234-9386Contact Email: library.cisp@gmail.comVisit our website: C.I. Library Hours of operation Monday: 10:00 - 9:00 Tuesday: 10:00 - 9:00 Wednesday: 10:00 - 9:00 Thursday: 10:00 - 9:00 Friday: 10:00 - 9:00 Saturday: 10:00 - 5:00 Sunday: 1:00 - 5:00 Copy Permalink: https://portal.suffolklibrarysystem.org/node/73 View Printer-friendly Send by email