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.

To obtain additional information about the historical maps, contact Mark Hansen at 515-239-1990 or email


Preview of map

State transportation maps
Official State of Iowa Transportation Maps, 1919-present
State transportation maps thumbnail link to webpage

Iowa registered highway routes, 1914-1925
State highway historic map thumbnail link

1914 county highway maps
Maps are in jpg format, links to Iowa DOT Historical Collections website
1914 county highway maps thumbnail link to historic collections website