Illinois - Criteria: C (architecture/engineering)
| 42nd Precinct Police Station |
| 7th District Police Station |
| Adams Building |
| Adams, Mary W., House |
| Adams Memorial Library |
| Adler, David, Estate |
| Adler, Mrs. Isaac D., House |
| Ahrens, Henry, House |
| Airtight Bridge |
| Akin, Mrs. Henry F., House |
| Allerton, Robert, Estate |
| Alpha Delta Phi Fraternity House |
| Alpha Delta Pi Sorority House |
| Alpha Gamma Delta Fraternity House |
| Alpha Phi Fraternity House-Beta Alpha Chapter |
| Alpha Rho Chi Fraternity House |
| Alpha Xi Delta Sorority Chapter House |
| Alta Vista Terrace Historic District |
| Altgeld Hall, University of Illinois |
| Alton Chapter House |
| Ambler's Texaco Gas Station |
| American State Bank |
| Anderson-Carlson Building |
| Anderson, John C., House |
| Andersonville Commercial Historic District |
| Andover Chapter House |
| Andridge Apartments |
| Annawan Chapter House |
| Aplington, Zenas, House |
| Appellate Court, 5th District |
| Aquitania, The |
| Arcada Theater Building |
| Arcola Carnegie Public Library |
| Armour, J. Ogden, House |
| Armour, Lester, House |
| Armour, Philip D., III, House |
| Armour Square |
| Armour's Warehouse |
| Ashelford Hall |
| Atkinson Hall |
| Atlanta Public Library |
| Auburn Gresham Bungalow Historic District |
| Auditorium Building, Roosevelt University |
| Aurora College Complex |
| Aurora Elks Lodge No. 705 |
| Austin Town Hall Park Historic District |
| Babylon Bend Bridge |
| Bach, Emil, House |
| Bachmann, Charles and Naomi, House |
| Badollet House |
| Baha'i Temple |
| Bailey-Michelet House |
| Bailey, William S., House |
| Baker, Frank J., House |
| Baker, George, House |
| Balaban and Katz Chicago Theatre |
| Balaban & Katz Uptown Theatre |
| Baldwin, Hiram, House |
| Banta, Nathaniel Moore, House |
| Baptist Retirement Home |
| Barber, Bryant H. and Lucie, House |
| Barber-Colman Company Historic District |
| Barber, Henry D., House |
| Barrington Historic District |
| Barry Historic District |
| Bassett, Orland P., House |
| Beach, Thomas A., House |
| Beall-Orr House |
| Beattie Park Mound Group |
| Beatty, Ross, House |
| Beatty, Ross J., House |
| Becker, A. G., Property |
| Beecher Hall, Illinois College |
| Beecher Mausoleum |
| Beith, William, House |
| Belden Stratford Hotel |
| Belleville Historic District |
| Belmonte Flats |
| Belmont-Sheffield Trust and Savings Bank Building |
| Belvidere High School |
| Belvidere North State Street Historic District |
| Belvidere South State Street Historic District |
| Benda House |
| Benjaminville Friends Meetinghouse and Burial Ground |
| Bennett, Edward H., House and Studio |
| Berger-Kiel House |
| Berger Park |
| Berlemann House |
| Bernadotte Bridge |
| Bersbach, Alfred, House |
| Berwyn Health Center |
| Berwyn Municipal Building |
| Best Brewing Company of Chicago Building |
| Best Building |
| Beta Theta Pi Fraternity House |
| B.F. Goodrich Company Showroom |
| Big Woods School |
| Black Hawk Museum and Lodge |
| Blackman, George, House |
| Black, Margaret, Farmstead |
Data from United States Park Service and Wikidata
