Below is a directory of all History Affiliates members. All-volunteer, small, and mid-sized history and heritage organizations (budgets under $1.5 million) in Bucks, Chester, Delaware, Montgomery, and Philadelphia counties of Pennsylvania are eligible to join History Affiliates. The most basic membership level is free; click here to learn more and become a member.

Organizations denoted "Small Archival Repository" participated in HSP's Hidden Collections Initiative for Pennsylvania Small Archival Repositories. More information on that project (made possible with funding from the Andrew W. Mellon Foundation) is available by clicking here.