HathiTrust membership currently consists of the member libraries of the Committee on Institutional Cooperation(CIC) the University of California system, and the University of Virginia, but is open to all interested research libraries. Current members include:
- California Digital Library
- Indiana University
- Michigan State University
- Northwestern University
- The Ohio State University
- Penn State University
- Purdue University
- University of California Berkeley
- University of California Davis
- University of California Irvine
- University of California Los Angeles
- University of California Merced
- University of California Riverside
- University of California San Diego
- University of California San Francisco
- University of California Santa Barbara
- University of California Santa Cruz
- The University of Chicago
- University of Illinois
- University of Illinois at Chicago
- The University of Iowa
- University of Michigan
- University of Minnesota
- University of Wisconsin-Madison
- University of Virginia
