Aaron Atherton House (Larue County, Kentucky)
Aaron Bronson House (New Haven County, Connecticut)
Abbot--Stinson House (Essex County, Massachusetts)
Abingdon Church (Gloucester County, Virginia)
Abner Phelps House (San Francisco County, California)
Abraham and Maria LeFevre House (Ulster County, New York)
Abraham Coult House (Hartford County, Connecticut)
Abraham Glen House (Schenectady County, New York)
Abram Demaree House (Bergen County, New Jersey)
Abram's Delight (Winchester, Virginia)
Achenbach House (Bergen County, New Jersey)
Acoma (Valencia County, New Mexico)
Adams, Abraham, House (Essex County, Massachusetts)
Adams--Clarke House (Essex County, Massachusetts)
Aigler Alumni Building (Seneca County, Ohio)
Albertus Van Loon House (Greene County, New York)
Alexandria Historic District (Alexandria, Virginia)
Allen, Abel, House (Middlesex County, Massachusetts)
Alloways Creek Friends Meetinghouse (Salem County, New Jersey)
Allyn Steele House (Hartford County, Connecticut)
Alna Meetinghouse (Lincoln County, Maine)
Amelia Cottage Museum (Suffolk County, New York)
Andover Center Historic District (Tolland County, Connecticut)
Andries DuBois House (Ulster County, New York)
Apponaug Historic District (Kent County, Rhode Island)
Arlington (Adams County, Mississippi)
Art Gallery (Cumberland County, Maine)
Asa Gillett House (Hartford County, Connecticut)
Aspetuck Historic District (Fairfield County, Connecticut)
Assonet Historic District (Bristol County, Massachusetts)
Atwater--Linton House (New Haven County, Connecticut)
Atwood-Higgins Historic District (Barnstable County, Massachusetts)
Auburn (Adams County, Mississippi)
August Aubuchon House (St. Louis County, Missouri)
Augusta Stone Church (Augusta County, Virginia)
Avery Clark House (Hartford County, Connecticut)
Avery Homestead (New London County, Connecticut)
Avery House (New London County, Connecticut)
Bacon, Stephen, House (Middlesex County, Massachusetts)
Ballou--Weatherhead House (Providence County, Rhode Island)
Barkhamsted Center Historic District (Litchfield County, Connecticut)
Barnaby House (Talbot County, Maryland)
Barnes--Frost House (Hartford County, Connecticut)
Battle Ground Historic District (Tippecanoe County, Indiana)
Beachbend (Suffolk County, New York)
Beardsley--Mix House (Hartford County, Connecticut)
Beaufort National Cemetery (Beaufort County, South Carolina)
Bedford Center Historic District (Middlesex County, Massachusetts)
Belle Isle (Lancaster County, Virginia)
Bellevue Rural Historic District (Bedford County, Virginia)
Bend Amateur Atheletic Club Gymnasium (Deschutes County, Oregon)
Benedict House and Shop (Fairfield County, Connecticut)
Beneventum Plantation House (Georgetown County, South Carolina)
Benjamin Bushnell Farm (Middlesex County, Connecticut)
Benjamin Colton House (Hartford County, Connecticut)
Benjamin Osborn House (Berkshire County, Massachusetts)
Bently Hall (Crawford County, Pennsylvania)
Bentonville High School (Benton County, Arkansas)
Berkley Crossroads Historic District (Harford County, Maryland)
Beverly Grammar School (Essex County, Massachusetts)
Bevier Stone House (Ulster County, New York)
Bickford, John, House (Middlesex County, Massachusetts)
Black Hawk Museum and Lodge (Rock Island County, Illinois)
Blackstone House (New Haven County, Connecticut)
Blanchard--Upton House (Essex County, Massachusetts)
Bloomington (Louisa County, Virginia)
Bloomsbury (Orange County, Virginia)
Blythewood (Maury County, Tennessee)
Boardman, John, House (Essex County, Massachusetts)
Boidstones Place (Jefferson County, West Virginia)
Bolton Center Historic District (Worcester County, Massachusetts)
Bolton Green Historic District (Tolland County, Connecticut)
Bonnet's Tavern (Bedford County, Pennsylvania)
Boonecroft (Berks County, Pennsylvania)
Boston National Historical Park (Suffolk County, Massachusetts)
Boutell--Hathorn House (Middlesex County, Massachusetts)
Bowers, Jerathmell, House (Middlesex County, Massachusetts)
Bowling Green Historic District (Caroline County, Virginia)
Bowman-Carney House (Lincoln County, Maine)
Boxborough Old Town Center (Middlesex County, Massachusetts)
Boxford Village Historic District (Essex County, Massachusetts)
Boxwood Hall (Union County, New Jersey)
Boykin's Tavern (Isle of Wight County, Virginia)
Boylan Heights (Wake County, North Carolina)
Brace, Moses--Uriah Cadwell House (Hartford County, Connecticut)
Bradford House (Plymouth County, Massachusetts)
Bradley--Hubbell House (Fairfield County, Connecticut)
Branford House (New London County, Connecticut)
Bray, Thomas, Farm (Barnstable County, Massachusetts)
Brewer, Moses, House (Middlesex County, Massachusetts)
Brewster Homestead (New London County, Connecticut)
Brewster House (Suffolk County, New York)
Brick House Ruin (Charleston County, South Carolina)
Broad Street Historic District (Middlesex County, Connecticut)
Broadway Historic District (Jefferson County, New York)
Bronson Place (Lucas County, Ohio)
Brooke's Bank (Essex County, Virginia)
Brooklyn Green Historic District (Windham County, Connecticut)
Brookside (Morris County, New Jersey)
Brookside Historic District (Middlesex County, Massachusetts)
Brown House (Essex County, Massachusetts)
Brown, Austin, House (Essex County, Massachusetts)
Brown--Stow House (Middlesex County, Massachusetts)
Browne, Abraham, House (Middlesex County, Massachusetts)
Brush Hill Historic District (Norfolk County, Massachusetts)
Buccleuch Mansion (Middlesex County, New Jersey)
Buck, Ephraim, House (Middlesex County, Massachusetts)
Budlong Farm (Kent County, Rhode Island)
Bullard, Isaac, House (Middlesex County, Massachusetts)
Burnell Tavern (Cumberland County, Maine)
Burnett's Corner Historic District (New London County, Connecticut)
Burnham, James, House (Essex County, Massachusetts)
Burnham-Patch House (Essex County, Massachusetts)
Bush--Holley House (Fairfield County, Connecticut)
Byers--Muma House (Lancaster County, Pennsylvania)
C. B. Bird House (Marathon County, Wisconsin)
Cadman--White--Handy House (Bristol County, Massachusetts)
Cady--Copp House (Windham County, Connecticut)
Caleb Baldwin Tavern (Fairfield County, Connecticut)
Calef, Dr. John, House (Essex County, Massachusetts)
Calhoun--Ives Historic District (Litchfield County, Connecticut)
Cameron Park (Wake County, North Carolina)
Campbell Park Historic District of Huron (Beadle County, South Dakota)
Cannondale Historic District (Fairfield County, Connecticut)
Canoe Brook Historic District (New Haven County, Connecticut)
Canterbury Center Historic District (Windham County, Connecticut)
Capt. Enoch Lord House (New London County, Connecticut)
Capt. George Dorrance House (Providence County, Rhode Island)
Capt. Josiah Cowles House (Hartford County, Connecticut)
Capt. Mark Stoddard Farmstead (New London County, Connecticut)
Capt. Oliver Gardiner House (Kent County, Rhode Island)
Capt. Thomas Fanning Farmstead (New London County, Connecticut)
Capt. William Bull Tavern (Litchfield County, Connecticut)
Carll, Ezra, Homestead (Suffolk County, New York)
Carlton--Frie--Tucker House (Essex County, Massachusetts)
Carpenter Homestead (Bristol County, Massachusetts)
Carrsbrook (Albemarle County, Virginia)
Carter's Grove (James City County, Virginia)
Carversville Historic District (Bucks County, Pennsylvania)
Caryl, Benjamin, House (Norfolk County, Massachusetts)
Case's Corner Historic District (Middlesex County, Massachusetts)
Cataldo Mission (Kootenai County, Idaho)
Cate House (Hancock County, Maine)
Cavarly Cottage (Ocean County, New Jersey)
Cedar Bend Plantation (Natchitoches Parish, Louisiana)
Cedar Ridge (Surry County, Virginia)
Center Bridge Historic District (Bucks County, Pennsylvania)
Central Street Historic District (Worcester County, Massachusetts)
Chandler, Capt. Seth, House (Windham County, Connecticut)
Chapel of Santa Cruz (Taos County, New Mexico)
Chase, Salmon P., Birthplace (Sullivan County, New Hampshire)
Chase, Samuel, House (Essex County, Massachusetts)
Cherry Hill (Albany County, New York)
Chester Center Historic District (Hampden County, Massachusetts)
Chestnut Street District (Essex County, Massachusetts)
Christ Church (Charleston County, South Carolina)
Christ Episcopal Church (Westchester County, New York)
Christ Episcopal Church (St. Mary's County, Maryland)
Christoffel Vought Farmstead (Hunterdon County, New Jersey)
Church of the Holy Family (St. Clair County, Illinois)
Claflin-Richards House (Essex County, Massachusetts)
Clapp Houses (Suffolk County, Massachusetts)
Clark Homestead (New London County, Connecticut)
Clark--Chalker House (Clay County, Florida)
Clermont (Clarke County, Virginia)
Clinton Village Historic District (Middlesex County, Connecticut)
Cobb's Tavern (Norfolk County, Massachusetts)
Cocke's Mill House and Mill Site (Albemarle County, Virginia)
Coeymans--Bronck Stone House (Albany County, New York)
Coffin's Grove Stagecoach House (Delaware County, Iowa)
Cogswell's Grant (Essex County, Massachusetts)
Coker, Benjamin, House (Essex County, Massachusetts)
Col. J. A. Banks House (Calhoun County, South Carolina)
Colburn, William, House (Penobscot County, Maine)
Colchester Village Historic District (New London County, Connecticut)
Colebrook Center Historic District (Litchfield County, Connecticut)
Coleman Station Historic District (Dutchess County, New York)
Collen Brook Farm (Delaware County, Pennsylvania)
Colonial Annapolis Historic District (Anne Arundel County, Maryland)
Colonial Germantown Historic District (Philadelphia County, Pennsylvania)
Columbia Green Historic District (Tolland County, Connecticut)
Commodore Oliver Perry Farm (Washington County, Rhode Island)
Conference House (Richmond County, New York)
Conklin, Nathaniel, House (Suffolk County, New York)
Cooper River Historic District (Berkeley County, South Carolina)
Coquille River Light (Coos County, Oregon)
Coram Shipyard Historic District (Bristol County, Massachusetts)
Cordts Mansion (Ulster County, New York)
Cornelius S. Muller House (Columbia County, New York)
Cornell Farmhouse (Queens County, New York)
Corning, Samuel, House (Essex County, Massachusetts)
Coulter House (San Diego County, California)
Coventry Hall (Chester County, Pennsylvania)
Coward--Smith House (Monmouth County, New Jersey)
Criss Cross (New Kent County, Virginia)
Cromwell's Run Rural Historic District (Fauquier County, Virginia)