Dewey Decimal Numbers: Illinois
General information about Illinois is found in 977.3. Knowing the Dewey Decimal number for a county or a series of counties within a state makes it easier for a researcher to browse the shelves. The following chart lists Illinois' counties in alphabetical order followed by their Dewey Decimal number.
| Adams | 977.344 | Hardin | 977.398 | Morgan | 977.3463 |
| Alexander | 977.3999 | Henderson | 977.3413 | Moultrie | 977.3675 |
| Bond | 977.3873 | Henry | 977.338 | Ogle | 977.332 |
| Boone | 977.329 | Iroquois | 977.364 | Peoria | 977.352 |
| Brown | 977.3473 | Jackson | 977.3994 | Perry | 977.393 |
| Bureau | 977.3372 | Jasper | 977.374 | Piatt | 977.3673 |
| Calhoun | 977.3853 | Jefferson | 977.3793 | Pike | 977.3453 |
| Carroll | 977.3345 | Jersey | 977.3855 | Pope | 977.3991 |
| Cass | 977.3465 | Jo Daviess | 977.3343 | Pulaski | 977.3998 |
| Champaign | 977.366 | Johnson | 977.3996 | Putnam | 977.3375 |
| Christian | 977.381 | Kane | 977.323 | Randolph | 977.392 |
| Clark | 977.371 | Kankakee | 977.363 | Richland | 977.377 |
| Clay | 977.3795 | Kendall | 977.3263 | Rock Island | 977.3393 |
| Clinton | 977.3875 | Knox | 977.349 | Saint Clair | 977.389 |
| Coles | 977.372 | Lake | 977.321 | Saline | 977.3992 |
| Cook | 977.31 | La Salle | 977.327 | Sangamon | 977.356 |
| Crawford | 977.375 | Lawrence | 977.376 | Schuyler | 977.3475 |
| Cumberland | 977.373 | Lee | 977.336 | Scott | 977.3455 |
| De Kalb | 977.328 | Livingston | 977.361 | Shelby | 977.3798 |
| De Witt | 977.3585 | Logan | 977.357 | Stark | 977.3513 |
| Douglas | 977.368 | Macon | 977.3582 | Stephenson | 977.333 |
| Du Page | 977.324 | Macoupin | 977.383 | Tazewell | 977.354 |
| Edgar | 977.369 | Madison | 977.386 | Union | 977.3995 |
| Edwards | 977.3791 | Marion | 977.3794 | Vermilion | 977.365 |
| Effingham | 977.3796 | Marshall | 977.3515 | Wabash | 977.378 |
| Fayette | 977.3797 | Mason | 977.3553 | Warren | 977.3415 |
| Ford | 977.362 | Massac | 977.3997 | Washington | 977.388 |
| Franklin | 977.394 | McDonough | 977.342 | Wayne | 977.3792 |
| Fulton | 977.348 | McHenry | 977.322 | White | 977.396 |
| Gallatin | 977.397 | McLean | 977.359 | Whiteside | 977.335 |
| Greene | 977.384 | Menard | 977.3555 | Will | 977.325 |
| Grundy | 977.3265 | Mercer | 977.3395 | Williamson | 977.3993 |
| Hamilton | 977.395 | Monroe | 977.391 | Winnebago | 977.331 |
| Hancock | 977.343 | Montgomery | 977.382 | Woodford | 977.353 |
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Modified: 31 Jul 2008