There are many online digital encyclopedias. Here are a links to some of them.
Ohio History Central
Ohio History Central is an evolving, dynamic online encyclopedia that includes information about Ohio’s natural history, prehistory, and history.
Handbook of Texas Online
The Handbook of Texas Online is a multidisciplinary encyclopedia of Texas history, geography, and culture sponsored by the Texas State Historical Association.
Encyclopedia of Alabama
EOA is a reliable resource covering the state’s history, culture, geography, and natural environment. Like a traditional encyclopedia, it contains authoritative content based on sound scholarship.
New Georgia Encyclopedia
The New Georgia Encyclopedia is an authoritative source on the people, places, events, and institutions of Georgia. The site contains nearly 2,000 articles and more than 5,000 images and audio and video clips on the history, culture, and life of the state.
HistoryLink.org provides a free, authoritative, and easily accessible history reference for the benefit of students, teachers, journalists, scholars, researchers, and the general public about Washington State.
Encyclopedia of Arkansas
The Encyclopedia of Arkansas is a free, authoritative source of information about the rich history, geography, and culture of Arkansas.
Tennessee Encyclopedia of History and Culture
The Tennessee Encyclopedia of History and Culture, the first comprehensive reference work of its kind produced for the great state of Tennessee.
Encyclopedia Virginia is a publicly accessible online publication of the Virginia Foundation for the Humanities. As a web publication, the Encyclopedia adds an entirely new dimension to the work done by VFH over the last thirty years. With the mission to develop the civic, cultural, and intellectual life of the Commonwealth by creating learning opportunities for all Virginians, VFH brings together the resources and content to make the Encyclopedia a valuable tool for exploring the people, history, government, economy, and culture of Virginia.
Encyclopedia of Chicago History
The Encyclopedia of Chicago provides a dynamic overview of the metropolitan history of Chicago. Thousands of historical resources-including articles, photos, maps, broadsides and newspapers-related to Chicago’s colorful and complex history are available for you to explore.
The web edition of The Kentucky Encyclopedia contains all of the entries in the print and CD-ROM editions published by the The University Press of Kentucky, along with selected front and back matter.
Encyclopedia of Oklahoma History and Culture
Oklahoma became the 46th state in 1907. To commemorate the Centennial of Statehood in 2007, the Oklahoma Historical Society, with funding from the National Endowment for the Humanities, developed the Encyclopedia of Oklahoma History & Culture to inform and educate citizens, students, historians, and the world at large about the fascinating history of this most unusual state.
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