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The Allegheny County Law Library is the only public law library in Allegheny County. It has been serving the community and the court system for over 150 years.

In 1867, Act No. 1211 provided for the purchase and support of a county law library, to be kept in, or near, the courthouse for the use of area citizens.

Percy Digby was the first library director, serving from 1885 to 1907. Today, the Allegheny County Law Library is managed by the Duquesne University Center for Legal Information through a unique joint-library partnership. Based on an agreement between Duquesne University and Allegheny County, the two libraries offer legal research collections and services that meet the needs of the legal community as well as the public of Allegheny County and western Pennsylvania.

The Collections

The library’s collection consists of more than 150,000 volumes dating from 1488 to the present.

Electronic Databases

Library Card holders have access to Westlaw and Lexis in the library as well as other selected online databases such as HeinOnline and LegalTrac.

Pennsylvania Legal Research

The Pennsylvania collection contains copies of all current Pennsylvania primary and secondary sources including constitutions, statutory law, case law, and administrative law. There is a complete collection of treatises and continuing legal education materials. Our appellate court brief collection dates from 1853 to present.

Rare Books Collection

The library has an extensive rare book collection, possessing most of the primary and secondary treatises in Anglo-American law dating back to the 16th century.

Microform Collection

The library has an extensive microform collection of over 2,500 rolls of film and 500,000 pieces of microfiche. We have back files of Congressional Globe and Record, C.F.R. and Federal Register. Congressional publications since 1978, all states court reports pre-1920s, all states-attorneys-general opinions, U.S. Supreme Court briefs since 1974, complete set of Pennsylvania county reports, Pennsylvania appellate court briefs since 1980 (Commonwealth since 1970), eight states superseded statutes, older Federal administrative law materials, and some English case law.

Federal Depository Library Program

FDLP Program Logo

The ACLL is a congressionally designated depository for U.S. Government documents. Public access to the government documents collection is guaranteed by public law (Title 44 United States Code). If you have questions concerning use of government documents, please ask a librarian or staff member.

History of the ACLL presentation
(created by Lori Hagen for our 150th anniversary celebration)

150th Anniversary of the Allegheny County Law Library Celebration