Classified for credit

Antebellum Greek Revival house in Mobile, AL interpreting 19th-century Southern domestic history and Mobile's antebellum social structure.

Local history museum documenting Ocean City's coastal and resort heritage — covers maritime history, shore community development, and regional geography.

Local historical society museum in Oelwein, Iowa — covers regional settlement, railroad, and community history of northeastern Iowa.

Historic mansion at Oglebay Resort documenting Wheeling-area industrial and domestic history — supports Appalachian regional history and material culture study.

Small museum covering Ogunquit's fishing, maritime, and art-colony history — local New England heritage and 20th-century cultural history.

Small-town museum in Ashville, OH documenting local rural and community history — supports Ohio local history and social studies.

Local history museum documenting the Ojai Valley's Chumash heritage, ranching era, and 20th-century community development.

Restored 19th-century county jail repurposed as a local history museum — covers criminal justice history, Georgia county settlement, and period social conditions.

South Dakota's original courthouse now housing regional history exhibits — covers territorial law, settlement history, and Great Plains social studies.

Local fort museum covering early New York colonial and military history; specific period and scope depend on site's particular focus.

Preserved 19th-century county jail converted to a museum — covers Texas frontier law enforcement, incarceration history, and local Red River county heritage.

Small local history museum in Delta, PA documenting the slate industry and rural community heritage of York County.

Small Wyoming church-turned-museum — covers pioneer settlement, frontier religion, and local community history in the Star Valley region.

Preserved 19th-century stagecoach stop on the historic wire road in Waynesville — covers overland travel, westward expansion, and Civil War–era Missouri.

Small local history museum in a historic town hall — covers Melbourne Beach settlement, early Florida civic history, and local government.

Small-town Michigan historical museum preserving local and regional history of the northern Lower Peninsula through artifacts and period displays.

Preserved 19th-century mansion of the Oneida utopian community — covers communal living experiments, religious history, and Victorian social reform.

Pioneer history museum in Malad City covering early Mormon settlement and Oneida County frontier life in southern Idaho.

County history museum covering Onslow County, NC — local military, agricultural, and civilian history from colonial era through modern times.

Small-town history museum covering Oriental's maritime and fishing heritage on the Pamlico Sound.

Osage County historical society museum covering Native American and settler history of the Osage Nation homeland in northeastern Oklahoma.

County history museum in Syracuse, NE preserving artifacts and records of Otoe County pioneer settlement and Nebraska agricultural heritage.

County historical society covering Otsego County settlement and regional Michigan history — local history and social studies primary source work.

State archive and research center documenting Outer Banks history — covers exploration, maritime history, and North Carolina coastal settlement.