Darby Borough is located west of Cobbs Creek in Delaware County, Pennsylvania. The village of Darby had its first town meeting in 1683 and was incorporated as a borough in 1852. Nicknamed "The Gateway To The South" because of its status as a popular way station for travelers between Baltimore and Philadelphia, Darby was also an important stop for many freedom seekers on the Underground Railroad. The Darby Free Library local history collection, 1873-2014 (bulk 1970-2000), consists mostly of secondary-source materials, such as newspaper clippings, photocopies, computer print outs, color photographs from the late 20th century, flyers and pamphlets, and ephemera. There are also some original, primary-source documents, and a few maps and about half a dozen atlases of Darby, Delaware County, and vicinity.
The Darby Free Library is one of the oldest public libraries in the United States, and the first cultural institution in Darby, now part of Delaware County, Pennsylvania. Founded in 1743 as a subscription library, it became free to the public in 1898 and part of the Delaware County Library System in 1981. The Darby Free Library is still operational as of 2014. The Darby Library Company records, 1743-2012, include Board of Directors and stockholders' minute books, book acquisition and circulation records, financial records, other administrative papers, and various other materials from the Darby Free Library and the Darby Library Company, as well as other organizations that merged with the Darby Library Company, including the Delaware County Society for the Detection of Horse Thieves and the Recovery of Stolen Horses, and the Darby Home Protection Society.