Citizens' Trust Company Building (Vigo County, Indiana)
Citronelle Railroad Historic District (Mobile County, Alabama)
Citrus County Courthouse, Old (Citrus County, Florida)
City and County Building (Laramie County, Wyoming)
City and Town Hall (Ogle County, Illinois)
Former city and town hall now functioning as a museum
City Bank Building (Jackson County, Missouri)
City Building (Tyler County, West Virginia)
City Building (Kane County, Illinois)
City Club Building (St. Louis, Missouri)
City Creek Canyon Historic District (Salt Lake County, Utah)
City Fire Department (Muscogee County, Georgia)
City Garage Yard and Fire Drill Tower (Durham County, North Carolina)
City Hall (Washington, District of Columbia)
City Hall (Jefferson County, Washington)
City Hall (Essex County, Massachusetts)
City Hall (Hampden County, Massachusetts)
City Hall (Holt County, Missouri)
City Hall (Deer Lodge County, Montana)
City Hall (Berks County, Pennsylvania)
City Hall (Galveston County, Texas)
City Hall (Pulaski County, Kentucky)
City Hall (Mississippi County, Arkansas)
City Hall (Delaware County, Indiana)
City Hall (Solano County, California)
City Hall and Auditorium (Cedar County, Nebraska)
City Hall and Jail (Maricopa County, Arizona)
City Hall and Opera House (Ashland County, Ohio)
City Hall Historic District (Calhoun County, Michigan)
City Hall Historic District (Lowell) (Middlesex County, Massachusetts)
City Hall of Colorado City (El Paso County, Colorado)
City Hall Park Historic District (Chittenden County, Vermont)
City Hall Subway Station (IRT) (New York County, New York)
City Hall-Monument District (Hartford County, Connecticut)
City Hose Company No. 9 (Buchanan County, Missouri)
City Hospital Historic District (St. Louis, Missouri)
City Hotel (Clinton County, Iowa)
City Hotel (Tuolumne County, California)
City Hotel (Sauk County, Wisconsin)
Former hotel operating as a popular sports bar
City Hotel (Natchitoches Parish, Louisiana)
City Market (Petersburg, Virginia)
City Market (Scott County, Iowa)
City Market (Pike County, Missouri)
City Market (Marion County, Indiana)
City Market (Dane County, Wisconsin)
City Mills Building (Richland County, Ohio)
City National Bank Building (Harris County, Texas)
City National Bank Building (Cerro Gordo County, Iowa)
City National Bank Building (Stark County, Ohio)
City of Camden Historic District (Kershaw County, South Carolina)
Historic district in Camden, SC
City of Cheney Historic District (Spokane County, Washington)
City of St. Jude Historic District (Montgomery County, Alabama)
City Opera House (Grand Traverse County, Michigan)
City Park (Denver County, Colorado)
City Park Brewery (Philadelphia County, Pennsylvania)
City Pharmacy (Webster County, Nebraska)
City Point Historic District (Hopewell, Virginia)
City Point National Cemetery (Hopewell, Virginia)
City Stable and Garage (Middlesex County, Massachusetts)
City Tavern (Washington, District of Columbia)
City Veterinary Hospital (Tulsa County, Oklahoma)
City Water Department (Flathead County, Montana)
City Water Works (DeWitt County, Texas)
City Waterworks (Sarasota County, Florida)
Civic Center (Washington County, Oklahoma)
Civic Center Financial District (Los Angeles County, California)
Civic Club (New York County, New York)
Civic Institutions Historic District (New London County, Connecticut)
Civic Park Historic District (Genesee County, Michigan)
Clack House (Washington County, Arkansas)
Claflin College Historic District (Orangeburg County, South Carolina)
Claflin School (Middlesex County, Massachusetts)
Clague House (Cuyahoga County, Ohio)
Claiborne County Jail (Claiborne County, Tennessee)
Claiborne Parish Courthouse (Claiborne Parish, Louisiana)
Claiborne W. Nuckols Farmstead (Woodford County, Kentucky)
Clallam County Courthouse (Clallam County, Washington)
Clapham's Ferry (Loudoun County, Virginia)
Clapp Houses (Suffolk County, Massachusetts)
Clapp, Charles Q., Block (Cumberland County, Maine)
Clapp, Charles Q., House (Cumberland County, Maine)
Clapp, Lucius, Memorial (Norfolk County, Massachusetts)
Clapp, Silas, House (Kent County, Rhode Island)
Clapp-Cunningham Building (Lincoln County, Oklahoma)
Clara and Julius Schmidt House (Wabasha County, Minnesota)
Clara and Samuel B. Weinstein House (Clackamas County, Oregon)
Clara Barkley Dorr House (Escambia County, Florida)
Clara Barton School (Philadelphia County, Pennsylvania)
Clara Hill House (Ada County, Idaho)
Clare Congregational Church (Clare County, Michigan)
Claremont Apartments (Dallas County, Texas)
Claremont Central Business District (Sullivan County, New Hampshire)
Claremont City Hall (Sullivan County, New Hampshire)
Claremont High School Historic District (Catawba County, North Carolina)
Claremont Hotel (Hancock County, Maine)
Claremont Lower Village District (Sullivan County, New Hampshire)
Claremont Stables (New York County, New York)
Claremont Warehouse No. 34 (Sullivan County, New Hampshire)
Claremore Auto Dealership (Rogers County, Oklahoma)
Clarence B. Moore House (Philadelphia County, Pennsylvania)
Clarence Campbell House (Monroe County, West Virginia)
Clarence E. Francis House (Clackamas County, Oregon)
Clarence H. Cooke House (Honolulu County, Hawaii)
Clarence Hovermale House (Morgan County, West Virginia)
Clarence McCall House (Darlington County, South Carolina)
Clarence Peck Residence (Waukesha County, Wisconsin)
Clarence R. Prescott House (Missoula County, Montana)
Clarence R. Ware House (Gwinnett County, Georgia)
Clarendon Congregational Church (Rutland County, Vermont)
Clarendon House (Rutland County, Vermont)
Clarendon Plantation House (Avoyelles Parish, Louisiana)
Clarendon School (Arlington County, Virginia)
Claridge Manor Apartments (Jefferson County, Alabama)
Clarion County Courthouse and Jail (Clarion County, Pennsylvania)
Clark and Sorrell Garage (Durham County, North Carolina)
Clark Brothers Factory No. 1 (Hartford County, Connecticut)
Clark Brothers Factory No. 2 (Hartford County, Connecticut)
Clark C. Fowler House (Monroe County, Kentucky)
Clark County Courthouse (Clark County, South Dakota)
Clark County Courthouse (Clark County, Arkansas)
Clark County Jail (Clark County, Wisconsin)
Former jail now serving as a museum
Clark County Library (Clark County, Arkansas)
Clark Hall, University of Virginia (Albemarle County, Virginia)
Clark Hardware Company Building (Fayette County, Kentucky)
Clark Historic District (Washington County, Oregon)
Clark Homestead (New London County, Connecticut)
Clark House (Hot Spring County, Arkansas)
Clark House (Middlesex County, Massachusetts)
Clark House (Johnson County, Iowa)
Clark Lane Historic District (Davis County, Utah)
Clark Mansion (Spokane County, Washington)
Clark Memorial Hall (Lenawee County, Michigan)
Clark R. Griggs House (Champaign County, Illinois)
Clark Royster House (Mecklenburg County, Virginia)
Clark Thompson House (Hood River County, Oregon)
Clark Thread Company Historic District (Hudson County, New Jersey)
Clark University (Worcester County, Massachusetts)
Clark's Conveniency (Kent County, Maryland)
Clark, A. J., Store (Orange County, New York)
Clark, Ezra, House (Dutchess County, New York)
Clark--Chalker House (Clay County, Florida)
Clark--Eames House (Berkshire County, Massachusetts)
Clark--Whitton House (Angelina County, Texas)
Clark-Blackwell House (Muscatine County, Iowa)
Beautiful House, High on the Bluff, Overlooking the Mississippi River
Clark-Brown House (Rock County, Wisconsin)
Clark-Cardwell House (Fergus County, Montana)
Clark-Dearstyne-Miller Inn (Rensselaer County, New York)
Clark-McConnell House (Josephine County, Oregon)
Clark-Norton House (Josephine County, Oregon)
Clark-Taylor House (Utah County, Utah)
Clarkdale Historic District (Cobb County, Georgia)
Clarkdale Historic District (Yavapai County, Arizona)
Clarke & Courts Building (Harris County, Texas)
Clarke County Courthouse (Old) (Clarke County, Virginia)
Clarke County Jail (Clarke County, Georgia)
Clarke Hotel (Adams County, Nebraska)
Clarke Mills (Clarke County, Alabama)
A historic textile factory building in Jackson, Alabama.
Clarke--Harrell--Burson House (Crawford County, Arkansas)
Clarke--Mossman House (Multnomah County, Oregon)
Clarke--Palmore House (Henrico County, Virginia)
Clarke-Hobbs-Davidson House (Henderson County, North Carolina)
Clarkesville Garage (Habersham County, Georgia)
Clarks Grove Cooperative Creamery (Freeborn County, Minnesota)
Clarksburg Downtown Historic District (Harrison County, West Virginia)
Clarksburg School (Monmouth County, New Jersey)
Clarksburg Schoolhouse (Shelby County, Illinois)
Clarkson Corners Historic District (Monroe County, New York)
Clarkson Farm Complex (Williamsburg County, South Carolina)
Clarkson House (Meade County, Kentucky)
Clarkston Public Library (Asotin County, Washington)
Clarkston Village Historic District (Oakland County, Michigan)
Clarksville Architectural District (Montgomery County, Tennessee)
Clarksville Elementary School (Albany County, New York)
Clarksville Federal Building (Montgomery County, Tennessee)
Clarksville Foundry and Machine Works Office (Montgomery County, Tennessee)
Clarksville High School (Montgomery County, Tennessee)
Clarksville High School Building No. 1 (Johnson County, Arkansas)
Clarksville Historic District (Mecklenburg County, Virginia)
Clarksville Historic District (Pike County, Missouri)
Clarksville Industrial District (Montgomery County, Tennessee)
Clarksville Methodist Church (Montgomery County, Tennessee)
Clarksville National Guard Armory (Johnson County, Arkansas)
Clarkton Depot (Bladen County, North Carolina)
Class and Nachod Brewery (Philadelphia County, Pennsylvania)
Classic Theater (Montgomery County, Ohio)
Clatsop County Courthouse (Clatsop County, Oregon)
Claude Foulke House (Miller County, Arkansas)
Claude O. Marcyes House (Rosebud County, Montana)
Claudius Scott Cottage (Richland County, South Carolina)
Claughton--Wright House (Northumberland County, Virginia)