Illinois - Area of significance: Architecture
| Black, Margaret, Farmstead |
| Blackstone Hotel |
| Blair Historic District |
| Blair, William McCormick, Estate |
| Blanchard Hall |
| Bloomington Central Business District |
| Bloomington High School |
| Bloom Township High School |
| Bohemian National Cemetery |
| Bohlander, Jacob, House |
| Boult, H. P., House |
| Bradley, B. Harley, House and Stable |
| Braeside School |
| Brainerd Bungalow Historic District |
| Brainerd, Charles, House |
| Bressmer-Baker House |
| Bretz, John F., House and Warehouse |
| Brewer, May (Carns) and John E., House |
| Bridges, John, Tavern and Store Site |
| Briggs, Alexander, House |
| Brigham, Edmund D., House |
| Brinkerhoff, George M., House |
| Bristol Congregational Church |
| Broadview Hotel |
| Broadway Historic District |
| Brookner, Christopher, House |
| Brooks Catsup Bottle Water Tower |
| Brower, Adolphus W., House |
| Brown, William, Building |
| Bruce, James, Round Barn |
| Brunk Farmstead |
| Bryant, Francis E., House |
| Bryn Mawr Avenue Historic District |
| Buckingham Building |
| Buckles, Robert, Barn |
| Buena Park Historic District |
| Building at 1101-1113 Maple Avenue |
| Building at 1209-1217 Maple Avenue |
| Building at 1301-1303 Judson Avenue |
| Building at 1305-1307 Judson Avenue |
| Building at 1316 Maple Avenue |
| Building at 1401-1407 Elmwood Avenue |
| Building at 14-16 Pearson Street |
| Building at 1505-1509 Oak Avenue |
| Building at 1929-1931 Sherman Avenue |
| Building at 201 North Market Street |
| Building at 203-205 North Market Street |
| Building at 2440 N. Lakeview Avenue |
| Building at 2517 Central Street |
| Building at 2519 Central Street |
| Building at 2523 Central Street |
| Building at 257 East Delaware |
| Building at 320 West Oakdale Avenue |
| Building at 399 West Fullerton Parkway |
| Building at 417-419 Lee Street |
| Building at 548-606 Michigan Avenue |
| Building at 5510 North Sheridan |
| Building at 813-815 Forest Avenue |
| Building at 900 West Lake Street |
| Building at 923-925 Michigan Avenue |
| Building at 999 Michigan, 200 Lee |
| Buildings at 1104-1110 Seward |
| Buildings at 815-817 Brummel and 819-821 Brummel |
| Buildings at 860-880 Lake Shore Drive |
| Burgess-Osborne Memorial Auditorium |
| Burlingham Building |
| Burnham Athenaeum |
| Burns, Dr. William, House |
| Bush Temple of Music |
| Cairo Historic District |
| Caldwell Farmstead |
| Calumet Park |
| Calumet Plant, R. R. Donnelly & Sons Company |
| Campana Factory |
| Campbell, Albert, House |
| Camp Lincoln Commissary Building |
| Carling Hotel |
| Carlinville Chapter House |
| Carlinville Historic District |
| Carmi Chapter House |
| Carney, John, House |
| Carr House |
| Carroll County Courthouse |
| Carrollton Courthouse Square Historic District |
| Carson, Pirie, Scott and Company |
| Carter, Frederick B., Jr., House |
| Carthage Courthouse Square Historic District |
| Castle Tower Apartments |
| Castlewood Terrace |
| Catlow Theatre |
| Cedar Crest Addition Historic District |
| Central Berwyn Bungalow Historic District |
| Central Geneva Historic District |
| Centralia Commercial Historic District |
| Central Manufacturing District-Original East Historic District |
| Central Manufacturing District-Pershing Road Development Historic District |
| Central National Park Building |
| Central Springfield Historic District |
| Cermak Road Bridge Historic District |
| Champaign Downtown Commercial District |
Data from United States Park Service and Wikidata
