The Library depends on the support of the Trinity County Friends of the Library. The Friends were incorporated as a nonprofit 501(c)3 in 1986 and are the fundraising arm of the Library.  The Friends meet at the Library on the third Tuesday of each month from 12:00-1:00 and welcome all supporters.

The Trinity County Friends of the Library provide much needed support to the Library in many forms: advocacy, monetary support, valuable input and assistance with implementing new or improved services. As members of the community, the Friends have a vested interest in the continuing success and improvement of library services county-wide. The local Friends group is a registered non-profit 501(c)3 and includes the Hayfork Friends of the Library under its umbrella.