The following sites have been featured on The Octo:
- Active History
- The Adverts 250 Project
- African American Intellectual History Society
- Age of Revolutions
- American Philosophical Society
- American Studier
- An Acquired Taste (Swem Special Collections)
- AuntieQuarian
- Baltimore Histories Weekly
- The Beehive (Massachusetts Historical Society)
- Behind the Scenes (New York Historical Society)
- Library Company of Philadelphia
- Blogging Blackbeard
- Borealia: Early Canadian History
- Boston 1775
- Boundary Stones
- Broadstreet Blog
- Canadian Friends Historical Association
- The Charleston Museum
- Clements Library Chronicles
- The Collation (Folger Shakespeare Library)
- Common-place: The Journal of Early American Life
- Connecticut Explored
- Connecticut History (CT Humanities)
- Conversant (Peabody Essex Museum)
- Cotsen Children’s Library (Princeton University Library)
- Course of Human Events (Declaration Resources Project)
- Distillations
- The DLG B
- Encyclopedia Virginia Blog
- Face to Face (National Portrait Gallery)
- The Florida Memory Blog
- Fondly, Pennsylvania (Historical Society of Pennsylvania)
- ForEverythingNC (State Library of North Carolina)
- From the Desk of Kurt Manwaring
- Georgian Papers Programme
- Gotham (The Gotham Center for New York City History)
- Harvard University Press Blog
- Historiann
- History (The Official Journal of the Historical Association)
- History for All the People (State Archives of North Carolina)
- History Happens Here (Missouri Historical Society)
- Historic New Orleans Collection
- The History of Parliament
- History Today
- Imperial and Global Forum
- Inside the CHS (Connecticut Historical Society)
- JHI Blog
- Johns Hopkins University Press Blog
- The Journal of the American Revolution
- The Junto
- Legal History Blog
- Look what we found! (Detroit Historical Society)
- The Many-Headed Monster
- Mapping Early American Elections
- Maryland History by the Object
- Member Voices (American Association of State and Local History)
- Meridiana
- The Metropole (Urban History Association)
- New American Antiquarian
- New Orleans Historical
- Newport Historical Society
- Notches
- Not Even Past
- The Not So Innocents Abroad
- Nursing Clio
- Ohio History Connection
- Op-Ed (Yale Indian Papers Project)
- The Otter (Network in Canadian History & Environment)
- The Panorama (Journal of the Early Republic)
- Past is Present (American Antiquarian Society)
- Pedagogy & American Literary Studies
- Preservation Virginia
- Process History (Organization of American Historians)
- Projects in History
- The Recipes Project
- Religion in American History
- The Republic (Society for Historians of the Early American Republic)
- The Silver Crescent Standard (SC Department of Archives and History)
- Spitalfields Life
- Teaching and Learning Blog (Canadian Historical Association)
- Teaching US History
- Texas State Archives and Library Commission
- TEXTILIS
- TURN to a Historian
- Uncommonplace Book
- underbelly (Maryland Historical Society)
- Unlocked (Maryland Center for History and Culture)
- Unwritten Histories
- US Intellectual History
- The Village Broadside (Historic Deerfield)
- Virginia Humanities
- The Way of Improvement Leads Home
- Witchcraft in New Spain
- Witches of Massachusetts Bay
- Women at the Center (NY Historical Society)