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According to the Federal Highway Administration Interstate Highway Route Log and Finder List, Alaska has four Interstate highways that creates a 1,082.22-mile system in the northernmost state. Even though these routes are designated as Interstate highways, they are generally not constructed to Interstate standards and are signed as Alaska State Routes.
| Route | Southern/Western Terminus | Northern/Eastern Terminus
| A-1 | Interstate A-3 - Anchorage | Canadian Border - Yukon Territory
| | A-2 | Interstate A-1 - Tok Junction | Interstate A-4 - Fairbanks
| | A-3 | Soldotna | Interstate A-1 - Anchorage
| | A-4 | Interstate A-1 - Palmer | Interstate A-2 - Fairbanks
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| Route
| Mileage
| Cities
| Junctions
| State Routes
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| A-1
| 408.23
| Anchorage, Palmer, Tok Junction
| Interstate A-4 in Palmer; Interstate A-2 in Tok Junction
| Alaska 1, Anchorage east to Tok Junction; Alaska 2, Tok Junction east to International Border
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| A-2
| 202.18
| Anchorage, Palmer, Tok Junction
| Interstate A-4 in Palmer; Interstate A-2 in Tok Junction
| Alaska 2 from Tok Junction north to Fairbanks
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| A-3
| 148.12
| Soldotna, Anchorage
| Interstate A-1 in Anchorage
| Alaska 1 from Soldotna north to Anchorage
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| A-4
| 323.69
| Wasilla, Denali National Park, Fairbanks
| Interstate A-1 near Palmer; Interstate A-2 in Fairbanks
| Alaska 3 from its junction with Alaska 1 near Palmer north to Anchorage
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| Source: October 31, 2002 Interstate Route Log and Finders List |
For more details and pictures, see Oscar Voss's Alaska Interstate Ends. Thanks go to Oscar for assisting AARoads with constructing this page.
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