The historical maps are in Adobe® Portable Document Format (PDF). In order to view these files, you will need Adobe® Reader®. The larger PDF files can be up to 10 MB in size and may take longer to download on computers with a slower Internet connection.
| Map | Preview |
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| Previous State Transportation Maps Official State of Iowa Transportation Maps, 1919-present |
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| State Highway Historic Map Iowa registered highway routes, 1914-1925 |
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| 1986 County Highway and Transportation maps |
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| 1917 State of Iowa Map |
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| 1914 County Highway maps Maps are in jpg format, links to Iowa DOT Historical Collections website |
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| 1902 Iowa Rail Map |
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| 1895 State of Iowa Map |
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| 1855 Iowa Rail Map |
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