Illinois - Criteria: A (event)
| 7th District Police Station |
| Adams Memorial Library |
| Addams, John H., Homestead |
| Adler Planetarium |
| AF and AM Lodge 687, Orangeville |
| Airtight Bridge |
| Alexis Opera House |
| Allen Chapel African Methodist Episcopal Church |
| Allen School |
| Allentown Union Hall |
| 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 |
| Alton National Cemetery |
| Ambler's Texaco Gas Station |
| Amboy Illinois Central Depot |
| America Fore Building |
| American State Bank |
| Andersonville Commercial Historic District |
| Andover Chapter House |
| Andridge Apartments |
| Annawan Chapter House |
| Appellate Court, 5th District |
| Apple River Fort Site |
| Aquitania, The |
| Arcada Theater Building |
| Arcade Building |
| Arcola Carnegie Public Library |
| Ardmore Avenue Train Station |
| Ariston Cafe |
| Armour Square |
| Armour's Warehouse |
| Ashelford Hall |
| Auburn Gresham Bungalow Historic District |
| Aurora College Complex |
| Austin Town Hall Park Historic District |
| Automatic Electric Company Building |
| AVR 661 |
| Ayer Public Library |
| Ayers Bank Building |
| Babylon Bend Bridge |
| Baha'i Temple |
| Balaban and Katz Chicago Theatre |
| Balaban & Katz Uptown Theatre |
| Baltimore and Ohio Railroad Depot |
| Baptist Retirement Home |
| Barber-Colman Company Historic District |
| Batavia Institute |
| Battery Rock |
| Beardstown Grand Opera House |
| Beecher Hall, Illinois College |
| Beecher Mausoleum |
| Belmont-Sheffield Trust and Savings Bank Building |
| Belvidere Cafe, Motel and Gas Station |
| Belvidere North State Street Historic District |
| Belvidere South State Street Historic District |
| Benjaminville Friends Meetinghouse and Burial Ground |
| Bernadotte Bridge |
| Berwyn Health Center |
| Best Brewing Company of Chicago Building |
| Beta Theta Pi Fraternity House |
| Bethalto Village Hall |
| B.F. Goodrich Company Showroom |
| Biograph Theater Building |
| Bishop Hill Historic District |
| Black, Margaret, Farmstead |
| Black's Store |
| Blackstone Hotel |
| Blair Historic District |
| Blakeman Bridge |
| Blanchard Hall |
| Bloomingdale School-Village Hall |
| Bloomington Central Business District |
| Bohemian National Cemetery |
| Bowen, Joseph T., Country Club |
| Boyce Building |
| Braeside School |
| Brandon Road Lock and Dam Historic District |
| Broadview Hotel |
| Brooks Catsup Bottle Water Tower |
| Brown, Roger, Home and Studio |
| Brown Shoe Company Factory |
| Bruce, James, Round Barn |
| Brunk Farmstead |
| Brussels Historic District |
| Bryant, Francis E., House |
| Buckeye Bridge |
| Buckles, Robert, Barn |
| Buena Park Historic District |
| Buffalo Grove Lime Kiln |
| Buffalo Township Public Library |
| Building at 1101-1113 Maple Avenue |
| Building at 1209-1217 Maple Avenue |
Data from United States Park Service and Wikidata
