Dewey Decimal Numbers: Iowa
General information about Iowa is found in 977.7. 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 Iowa's counties in alphabetical order followed by their Dewey Decimal number.
| Adair | 977.773 | Floyd | 977.726 | Monona | 977.744 |
| Adams | 977.776 | Franklin | 977.728 | Monroe | 977.7865 |
| Allamakee | 977.733 | Fremont | 977.777 | Montgomery | 977.775 |
| Appanoose | 977.789 | Greene | 977.7466 | Muscatine | 977.768 |
| Audubon | 977.7486 | Grundy | 977.7537 | O’Brien | 977.714 |
| Benton | 977.761 | Guthrie | 977.749 | Osceola | 977.7116 |
| Black Hawk | 977.737 | Hamilton | 977.752 | Page | 977.778 |
| Boone | 977.7544 | Hancock | 977.724 | Palo Alto | 977.7155 |
| Bremer | 977.734 | Hardin | 977.7535 | Plymouth | 977.716 |
| Buchanan | 977.7382 | Harrison | 977.747 | Pocahontas | 977.719 |
| Buena Vista | 977.718 | Henry | 977.795 | Polk | 977.758 |
| Butler | 977.729 | Howard | 977.7312 | Pottawatamie | 977.771 |
| Calhoun | 977.743 | Humboldt | 977.7272 | Poweshiek | 977.7596 |
| Carroll | 977.7465 | Ida | 977.7422 | Ringgold | 977.7873 |
| Cass | 977.772 | Iowa | 977.7653 | Sac | 977.7424 |
| Cedar | 977.766 | Jackson | 977.764 | Scott | 977.769 |
| Cerro Gordo | 977.725 | Jasper | 977.7594 | Shelby | 977.7484 |
| Cherokee | 977.717 | Jefferson | 977.794 | Sioux | 977.713 |
| Chickasaw | 977.7315 | Johnson | 977.7655 | Story | 977.7546 |
| Clarke | 977.7856 | Jones | 977.763 | Tama | 977.756 |
| Clay | 977.7153 | Keokuk | 977.791 | Taylor | 977.779 |
| Clayton | 977.736 | Kossuth | 977.721 | Union | 977.7853 |
| Clinton | 977.767 | Lee | 977.799 | Van Buren | 977.798 |
| Crawford | 977.745 | Linn | 977.762 | Wapello | 977.793 |
| Dallas | 977.757 | Louisa | 977.7926 | Warren | 977.782 |
| Davis | 977.797 | Lucas | 977.7863 | Washington | 977.7923 |
| Decatur | 977.7875 | Lyon | 977.7114 | Wayne | 977.788 |
| Delaware | 977.7385 | Madison | 977.781 | Webster | 977.751 |
| Des Moines | 977.796 | Mahaska | 977.784 | Winnebago | 977.722 |
| Dickinson | 977.7123 | Marion | 977.783 | Winneshiek | 977.732 |
| Dubuque | 977.739 | Marshall | 977.755 | Woodbury | 977.741 |
| Emmett | 977.7125 | Mills | 977.774 | Worth | 977.7232 |
| Fayette | 977.735 | Mitchell | 977.7234 | Wright | 977.7274 |
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Modified: 31 Jul 2008