A. N. Tanner House (Box Elder County, Utah)
Aaronsburg Historic District (Centre County, Pennsylvania)
Abbeville (Lancaster County, Pennsylvania)
Abbot Tavern (Essex County, Massachusetts)
Abbott-Decou House (Mercer County, New Jersey)
Abel and Mary Nicholson House (Salem County, New Jersey)
Adams National Historic Site (Norfolk County, Massachusetts)
Agawam Center Historic District (Hampden County, Massachusetts)
Aiken, Abraham, House (Essex County, New York)
Airy Mount (Woodford County, Kentucky)
Alex Brown Building (Baltimore, Maryland)
Alexander Hamilton House (Franklin County, Pennsylvania)
All Faith Church (St. Mary's County, Maryland)
All Saints' Church (Calvert County, Maryland)
Allen House (Monmouth County, New Jersey)
Allen, Elisha, House (Bristol County, Massachusetts)
Allen, Zachariah, House (Providence County, Rhode Island)
Allentown Historic District (Monmouth County, New Jersey)
Alston-DeGraffenried House (Chatham County, North Carolina)
Amelung House and Glassworks (Frederick County, Maryland)
American Philosophical Society Hall (Philadelphia County, Pennsylvania)
Amos Evans House (Burlington County, New Jersey)
Amos Palmer House (Bucks County, Pennsylvania)
Anawan Club Clubhouse and Caretaker's House (Bristol County, Massachusetts)
Anderson House (New Castle County, Delaware)
Anderson-Capner House (Mercer County, New Jersey)
Andreas Rieth Homestead (Montgomery County, Pennsylvania)
Andrew Mann Inn (Otsego County, New York)
Andrew Scott House (Maury County, Tennessee)
Andrew, William, House (New Haven County, Connecticut)
Andrews Bridge Historic District (Lancaster County, Pennsylvania)
Andrews-Moore House (Franklin County, North Carolina)
Annington (Montgomery County, Maryland)
Appler--Englar House (Carroll County, Maryland)
Appleton Farm (Cheshire County, New Hampshire)
Appleton--Hannaford House (Cheshire County, New Hampshire)
Apponegansett Meeting House (Bristol County, Massachusetts)
Aquia Church (Stafford County, Virginia)
Arcadia Plantation (Georgetown County, South Carolina)
Archibald McAllister House (Dauphin County, Pennsylvania)
Archibald Smith House (Fulton County, Georgia)
Arlington (Somerset County, Maryland)
Arneytown Historic District (Burlington County, New Jersey)
Arnold Potter House (Yates County, New York)
Operating farm w/ Private Residence
Arnold S. Naudain House (New Castle County, Delaware)
Arnold-Wooldridge House (Woodford County, Kentucky)
Asbury Historic District (Unspecified county, New Jersey)
Ashlawn (New London County, Connecticut)
Ashley River Historic District (Unspecified county, South Carolina)
Aspen Hall (Chatham County, North Carolina)
Aspendale (Kent County, Delaware)
Assonet Historic District (Bristol County, Massachusetts)
Averasboro Battlefield Historic District (Harnett County, North Carolina)
Avondale (Carroll County, Maryland)
Babson-Alling House (Essex County, Massachusetts)
Bacon, Jabez, House (Litchfield County, Connecticut)
Bacon-Gleason-Blodgett Homestead (Middlesex County, Massachusetts)
Baker, Nathaniel, House (Barnstable County, Massachusetts)
Baker-Brearley House (Mercer County, New Jersey)
Bancroft, Samuel, House (Middlesex County, Massachusetts)
Banksia Hall (Barnwell County, South Carolina)
Historic Civil War era home in Barnwell, SC
Bardstown Historic District (Nelson County, Kentucky)
Barker House (Chowan County, North Carolina)
Barn at Oxford Horse Ranch (Albany County, Wyoming)
Barnes, Jonathan, House (Hillsborough County, New Hampshire)
Barratt Hall (Kent County, Delaware)
Batchelder, Nathaniel, House (Middlesex County, Massachusetts)
Battersea (Petersburg, Virginia)
Beadles House (Greene County, Virginia)
Beaver Dam (Wake County, North Carolina)
Beckford (Somerset County, Maryland)
Beech Hill (Cheshire County, New Hampshire)
Belair (Prince George's County, Maryland)
Belcaro (Denver County, Colorado)
Belcher-Ogden House (Union County, New Jersey)
Belfont Plantation House (Beaufort County, North Carolina)
Belgrade and St. David's Church (Washington County, North Carolina)
Bell Farmhouse (New Castle County, Delaware)
Bellair (Craven County, North Carolina)
Belle Mina (Limestone County, Alabama)
Bellefields (Prince George's County, Maryland)
Bellefonte Historic District (Centre County, Pennsylvania)
Bellemonte (Nash County, North Carolina)
Bellman's Union Church (Berks County, Pennsylvania)
Belmont (Charlottesville, Virginia)
Belmont Hall (Kent County, Delaware)
Belmont-Hillsboro Historic District (Davidson County, Tennessee)
Belvidere (Perquimans County, North Carolina)
Belvidere Plantation House (Pender County, North Carolina)
Bend of the Lane (Bristol County, Massachusetts)
Benjamin Blythe Homestead (Cumberland County, Pennsylvania)
Benjamin Clark House (Gloucester County, New Jersey)
Benjamin Jacobs House (Chester County, Pennsylvania)
Benjamin Riegel House (Bucks County, Pennsylvania)
Benjamin Smith House (Craven County, North Carolina)
Benjamin W. Davidson House (Mecklenburg County, North Carolina)
Berkeley (Charles City County, Virginia)
Berkley Historic District (Berks County, Pennsylvania)
Berry Hill (Jefferson County, Kentucky)
Beulah Presbyterian Church (Allegheny County, Pennsylvania)
Beverly (Worcester County, Maryland)
Biever House (Lebanon County, Pennsylvania)
Big Spring Church (Woodford County, Kentucky)
Bigelow Tavern Historic District (Worcester County, Massachusetts)
Bindnagles Evangelical Lutheran Church (Lebanon County, Pennsylvania)
Birchrunville Historic District (Chester County, Pennsylvania)
Bishop--Irick Farmstead (Burlington County, New Jersey)
Bissell Tavern-Bissell's Stage House (Hartford County, Connecticut)
Bixler, Michael and Magdealena Farmstead (York County, Pennsylvania)
Black Creek Rural Historic District (Wilson County, North Carolina)
Black Jack (Nash County, North Carolina)
Black Mansion (Hancock County, Maine)
Black Walnut (Halifax County, Virginia)
Blandfield (Essex County, Virginia)
Blenheim (Westmoreland County, Virginia)
Blish--Garret House (Barnstable County, Massachusetts)
Bliss, Daniel, Homestead (Bristol County, Massachusetts)
Bloomsbury (Frederick County, Maryland)
Bloomsbury (Orange County, Virginia)
Boalsburg Historic District (Centre County, Pennsylvania)
Bodo Otto House (Gloucester County, New Jersey)
Bohemia Farm (Cecil County, Maryland)
Bonar Hall (Morgan County, Georgia)
Borden-Winslow House (Bristol County, Massachusetts)
Boston National Historical Park (Suffolk County, Massachusetts)
Boston Post Road Historic District (Middlesex County, Massachusetts)
Bottle House Block (Middlesex County, Massachusetts)
Boush-Tazewell House (Norfolk, Virginia)
Boutell--Hathorn House (Middlesex County, Massachusetts)
Bouwerie (Columbia County, New York)
Bowen, Mathew, Homestead (Windham County, Connecticut)
Bowman Farm (Franklin County, Virginia)
Boydville (Berkeley County, West Virginia)
Branford-Horry House (Charleston County, South Carolina)
Braswell-Carnes House (Cobb County, Georgia)
Brattle, William, House (Middlesex County, Massachusetts)
Brattleboro Downtown Historic District (Windham County, Vermont)
Brattonsville Historic District (York County, South Carolina)
Bray, Thomas, Farm (Barnstable County, Massachusetts)
Bremo Slave Chapel (Fluvanna County, Virginia)
Brice House (Anne Arundel County, Maryland)
Bridge Street Neck Historic District (Essex County, Massachusetts)
Bridgepoint Historic District (Somerset County, New Jersey)
Brimfield Center Historic District (Hampden County, Massachusetts)
Brooke's Bank (Essex County, Virginia)
Brookland (Granville County, North Carolina)
Brown Pusey House Community Center (Hardin County, Kentucky)
Brown, John, House (Providence County, Rhode Island)
Brown, John, IV, House (Bristol County, Massachusetts)
Brown-Graves House and Brown's Store (Caswell County, North Carolina)
Brummell's Inn (Davidson County, North Carolina)
Bruton Parish Church (Williamsburg, Virginia)
Bryan Lathrop House (Cook County, Illinois)
Bucher Ayres Farm (Centre County, Pennsylvania)
Bucher Thal Historic District (Lancaster County, Pennsylvania)
Buckingham Friends Meeting House (Bucks County, Pennsylvania)
Buckland (Gates County, North Carolina)
Buffington, Deacon John, House (Bristol County, Massachusetts)
Building at 42 Edward J. Lopez Avenue (Middlesex County, Massachusetts)
Bullard Farm (Middlesex County, Massachusetts)
Bullen--Stratton--Cozzen House (Middlesex County, Massachusetts)
Bullet Hill School (New Haven County, Connecticut)
Burgholtshouse (York County, Pennsylvania)
Burleigh (Person County, North Carolina)
Burlington-Harmony Hill Roads Historic District (Litchfield County, Connecticut)
Byecroft Farm Complex (Bucks County, Pennsylvania)
Byers--Muma House (Lancaster County, Pennsylvania)
Cabe-Pratt-Harris House (Orange County, North Carolina)
Cabot, T.H., Cottage (Cheshire County, New Hampshire)
Cadman--White--Handy House (Bristol County, Massachusetts)
Callender House (Victoria County, Texas)
Cambridge Common Historic District (Middlesex County, Massachusetts)
Cambridge Historic District, Wards I and III (Dorchester County, Maryland)
Camden Historic District (Kent County, Delaware)
Cameron Estate (Lancaster County, Pennsylvania)
Camp-Woods (Delaware County, Pennsylvania)
Campbellton (Berkeley County, West Virginia)
Cannon's Ferry (Sussex County, Delaware)
Cappahosic House (Gloucester County, Virginia)
Capt. John Brewer House (Berkshire County, Massachusetts)
Carlton (Stafford County, Virginia)
Carlyle House (Alexandria, Virginia)
Carnegie Library of Barnesville (Lamar County, Georgia)
Carpenter Homestead (Bristol County, Massachusetts)
Carpenter House (Bristol County, Massachusetts)
Carpenter House (New London County, Connecticut)
Carpenter, Col. Thomas, III, House (Bristol County, Massachusetts)
Carpenters' Hall (Philadelphia County, Pennsylvania)
Carroll Place (Dorchester County, South Carolina)
Carter Hall (Clarke County, Virginia)
Cassville Crossroads Historic District (Ocean County, New Jersey)
Cave Place (Fayette County, Kentucky)
Caves Valley Historic District (Baltimore County, Maryland)
Centre Furnace Mansion House (Centre County, Pennsylvania)
Chambersburg Historic District (Franklin County, Pennsylvania)
Chancellor James P. Carroll House (Aiken County, South Carolina)
Chandler-Bigsby-Abbot House (Essex County, Massachusetts)