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| | About this site |
 | | Where applicable, all known branches of the route (past and present, including suffixed and business routes) are listed at the end of the individual route listings. |
| | Highway markers are also included to the left of the listings; they do not appear if the route is not signed (e.g., much of the 900 series). |
| | Counties: A list of the counties, from north to south or west to east, that the route goes through. |
| iowahighways.home.mchsi.com /highways/about.html |
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