This is a list of properties and districts in Illinois that are on the National Register of Historic Places. There are over 1,900 in total. Of these, 85 are National Historic Landmarks. There are listings in all of the state's 102 counties.
| County |
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| 1 | Adams | 27 | |||
| 2 | Alexander | 8 | |||
| 3 | Bond | 2 | |||
| 4 | Boone | 6 | |||
| 5 | Brown | 2 | |||
| 6 | Bureau | 19 | |||
| 7 | Calhoun | 7 | |||
| 8 | Carroll | 7 | |||
| 9 | Cass | 2 | |||
| 10 | Champaign | 60 | |||
| 11 | Christian | 6 | |||
| 12 | Clark | 9 | |||
| 13 | Clay | 6 | |||
| 14 | Clinton | 2 | |||
| 15 | Coles | 21 | |||
| 16.1 | Cook: Central Chicago | 124 | |||
| 16.2 | Cook: North Side Chicago | 96 | |||
| 16.3 | Cook: South Side Chicago | 105 | |||
| 16.4 | Cook: West Side Chicago | 73 | |||
| 16.5 | Cook: Evanston | 62 | |||
| 16.6 | Cook: Other | 136 | |||
| Cook: Duplicates | (4)[1] | ||||
| Cook: Total | 592 | ||||
| 17 | Crawford | 7 | |||
| 18 | Cumberland | 3 | |||
| 19 | DeKalb | 17 | |||
| 20 | DeWitt | 2 | |||
| 21 | Douglas | 3 | |||
| 22 | DuPage | 48 | |||
| 23 | Edgar | 9 | |||
| 24 | Edwards | 1 | |||
| 25 | Effingham | 3 | |||
| 26 | Fayette | 4 | |||
| 27 | Ford | 5 | |||
| 28 | Franklin | 3 | |||
| 29 | Fulton | 42 | |||
| 30 | Gallatin | 6 | |||
| 31 | Greene | 12 | |||
| 32 | Grundy | 7 | |||
| 33 | Hamilton | 4 | |||
| 34 | Hancock | 13 | |||
| 35 | Hardin | 5 | |||
| 36 | Henderson | 4 | |||
| 37 | Henry | 15 | |||
| 38 | Iroquois | 6 | |||
| 39 | Jackson | 19 | |||
| 40 | Jasper | 1 | |||
| 41 | Jefferson | 2 | |||
| 42 | Jersey | 21 | |||
| 43 | Jo Daviess | 18 | |||
| 44 | Johnson | 4 | |||
| 45 | Kane | 81 | |||
| 46 | Kankakee | 16 | |||
| 47 | Kendall | 11 | |||
| 48 | Knox | 7 | |||
| 49 | LaSalle | 32 | |||
| 50 | Lake | 97 | |||
| 51 | Lawrence | 2 | |||
| 52 | Lee | 10 | |||
| 53 | Livingston | 15 | |||
| 54 | Logan | 12 | |||
| 55 | Macon | 10 | |||
| 56 | Macoupin | 8 | |||
| 57 | Madison | 43 | |||
| 58 | Marion | 8 | |||
| 59 | Marshall | 2 | |||
| 60 | Mason | 4 | |||
| 61 | Massac | 3 | |||
| 62 | McDonough | 8 | |||
| 63 | McHenry | 13 | |||
| 64 | McLean | 35 | |||
| 65 | Menard | 5 | |||
| 66 | Mercer | 12 | |||
| 67 | Monroe | 7 | |||
| 68 | Montgomery | 13 | |||
| 69 | Morgan | 10 | |||
| 70 | Moultrie | 1 | |||
| 71 | Ogle | 28 | |||
| 72 | Peoria | 36 | |||
| 73 | Perry | 3 | |||
| 74 | Piatt | 6 | |||
| 75 | Pike | 14 | |||
| 76 | Pope | 3 | |||
| 77 | Pulaski | 4 | |||
| 78 | Putnam | 4 | |||
| 79 | Randolph | 18 | |||
| 80 | Richland | 4 | |||
| 81 | Rock Island | 28 | |||
| 82 | St. Clair | 30 | |||
| 83 | Saline | 4 | |||
| 84 | Sangamon | 64 | |||
| 85 | Schuyler | 2 | |||
| 86 | Scott | 2 | |||
| 87 | Shelby | 6 | |||
| 88 | Stark | 1 | |||
| 89 | Stephenson | 16 | |||
| 90 | Tazewell | 17 | |||
| 91 | Union | 8 | |||
| 92 | Vermilion | 13 | |||
| 93 | Wabash | 1 | |||
| 94 | Warren | 11 | |||
| 95 | Washington | 3 | |||
| 96 | Wayne | 3 | |||
| 97 | White | 11 | |||
| 98 | Whiteside | 14 | |||
| 99 | Will | 40 | |||
| 100 | Williamson | 5 | |||
| 101 | Winnebago | 42 | |||
| 102 | Woodford | 7 | |||
| (duplicates) | (9)[2] | ||||
| Total: | 1,961 | ||||
See main article: National Register of Historic Places listings in Adams County, Illinois.
See main article: National Register of Historic Places listings in Alexander County, Illinois.
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See main article: National Register of Historic Places listings in Bureau County, Illinois.
See main article: National Register of Historic Places listings in Calhoun County, Illinois.
See main article: National Register of Historic Places listings in Carroll County, Illinois.
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See main article: National Register of Historic Places listings in Champaign County, Illinois.
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See main article: National Register of Historic Places listings in Clark County, Illinois.
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See main article: National Register of Historic Places listings in Coles County, Illinois.
See main article: National Register of Historic Places listings in Cook County, Illinois.
See main article: National Register of Historic Places listings in Crawford County, Illinois.
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See main article: National Register of Historic Places listings in DeKalb County, Illinois.
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See main article: National Register of Historic Places listings in DuPage County, Illinois.
See main article: National Register of Historic Places listings in Edgar County, Illinois.
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See main article: National Register of Historic Places listings in Fulton County, Illinois.
See main article: National Register of Historic Places listings in Gallatin County, Illinois.
See main article: National Register of Historic Places listings in Greene County, Illinois.
See main article: National Register of Historic Places listings in Grundy County, Illinois.
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See main article: National Register of Historic Places listings in Hancock County, Illinois.
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See main article: National Register of Historic Places listings in Henry County, Illinois.
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See main article: National Register of Historic Places listings in Jackson County, Illinois.
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See main article: National Register of Historic Places listings in Jersey County, Illinois.
See main article: National Register of Historic Places listings in Jo Daviess County, Illinois.
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See main article: National Register of Historic Places listings in Kane County, Illinois.
See main article: National Register of Historic Places listings in Kankakee County, Illinois.
See main article: National Register of Historic Places listings in Kendall County, Illinois.
See main article: National Register of Historic Places listings in Knox County, Illinois.
See main article: National Register of Historic Places listings in LaSalle County, Illinois.
See main article: National Register of Historic Places listings in Lake County, Illinois.
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See main article: National Register of Historic Places listings in Lee County, Illinois.
See main article: National Register of Historic Places listings in Livingston County, Illinois.
See main article: National Register of Historic Places listings in Logan County, Illinois.
See main article: National Register of Historic Places listings in McDonough County, Illinois.
See main article: National Register of Historic Places listings in McHenry County, Illinois.
See main article: National Register of Historic Places listings in McLean County, Illinois.
See main article: National Register of Historic Places listings in Macon County, Illinois.
See main article: National Register of Historic Places listings in Macoupin County, Illinois.
See main article: National Register of Historic Places listings in Madison County, Illinois.
See main article: National Register of Historic Places listings in Marion County, Illinois.
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See main article: National Register of Historic Places listings in Mercer County, Illinois.
See main article: National Register of Historic Places listings in Monroe County, Illinois.
See main article: National Register of Historic Places listings in Montgomery County, Illinois.
See main article: National Register of Historic Places listings in Morgan County, Illinois.
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See main article: National Register of Historic Places listings in Ogle County, Illinois.
See main article: National Register of Historic Places listings in Peoria County, Illinois.
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See main article: National Register of Historic Places listings in Pike County, Illinois.
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See main article: National Register of Historic Places listings in Randolph County, Illinois.
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See main article: National Register of Historic Places listings in Rock Island County, Illinois.
See main article: National Register of Historic Places listings in St. Clair County, Illinois.
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See main article: National Register of Historic Places listings in Sangamon County, Illinois.
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See main article: National Register of Historic Places listings in Stephenson County, Illinois.
See main article: National Register of Historic Places listings in Tazewell County, Illinois.
See main article: National Register of Historic Places listings in Union County, Illinois.
See main article: National Register of Historic Places listings in Vermilion County, Illinois.
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See main article: National Register of Historic Places listings in Warren County, Illinois.
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See main article: National Register of Historic Places listings in White County, Illinois.
See main article: National Register of Historic Places listings in Whiteside County, Illinois.
See main article: National Register of Historic Places listings in Will County, Illinois.
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See main article: National Register of Historic Places listings in Winnebago County, Illinois.
See main article: National Register of Historic Places listings in Woodford County, Illinois.