The Twin Rivers Branch is offering only curbside pickup until further notice. Curbside hours are M-Th from 9:30 am - 8:15 pm, F-Sat from 9:30 am - 4:45 pm. Outdoor programming will continue as scheduled. Thank you for your patience during this time. Click here to schedule a curbside appointment.

Hours Expand September 7th

Hours Expand September 7th

On September 7th, library open hours will expand to open at 9:30 am and close at 8:30 pm on Mondays, Tuesdays, and Wednesdays. On Thursdays, curbside hours will decrease to 9:30 am to 12:30pm and library open hours will be after that from 1:00 to 8:30 pm. Fridays and Saturdays will open earlier at 9:30 am to 5:00 pm. In addition, we will open on Sundays from 12:30 pm – 5:00 pm at Ewing, Hickory Corner, Lawrence, and West Windsor. All other branches will remain closed on Sundays.

Hollowbrook Branch

Since the Library Branch is located inside the Hollowbrook Community Center, the hours are restricted to the Center’s hours.

Library Open Hours

Monday—Friday: 9:00 am to 12:00 pm and 1:00 pm – 5:00.

Curbside Pick-Up

Monday—Friday: 10:00 am to 12:00 pm and 1:00 pm – 4:00.

For more information on the Center, go to the Hollowbrook Community Center page.

For more information on the Branch inside the Center, go to the Hollowbrook Branch page.

All Other Branches


Library Hours: 9:30 am – 8:30 pm


Curbside Hours: 9:30 am – 12:30 pm
Library Hours: 1:00 pm – 8:30 pm

Fridays and Saturdays

Library Hours: 9:30 am – 5:00 pm


Library Hours at Ewing, Hickory Corner, Lawrence, and West Windsor: 12:30 pm – 5:00 pm
All other branches: Closed

Public Spaces

Community Rooms have reopened at a limited capacity. You must submit a request to reserve a community room at one of our branches. For more information, visit:

Technology Instruction

MCL is now offering a hybrid of in-person classes, “live” virtual classes, and videos on MCL’s Youtube channel. For more information visit:

Virtual Services

The Mercer County Library System is currently offering the following Virtual Services:

  • Citizenship Exam Practice
  • Job Interview Practice
  • Resume Review
  • College Application Essay Review
  • Personalized Picks: Reader’s Advisory
  • Remote Printing
  • One-on-One Computer Help
  • Virtual Reference Desk Chat

For more information visit: